Reference Standards

British Pharmacopoeia Chemical reference substances (BPCRS)

These Primary standards are established using absolute methods and the declared content figures are determined without comparing to another substance. You should use BPCRS to perform the tests in the British Pharmacopoeia (BP) or BP (Veterinary). Do not eat BPCRS or feed them to animals – you should only use BPCRS for chemical analysis. They are not suitable for any other use.

The BPCRS Catalogue is now available for download in Excel format, updated monthly to reflect the latest listings.

Search within this catalogue

951 items

  • Search result 1

    Category Number 245
    Pack size 25 mg
    Substance name (1-methyl-5-nitroimidazol-2-yl)methanol
    CAS Number 936-05-0
    Quantitative No
    Current batch 2688
    QTY (Max 1)

  • Search result 2

    Category Number 37
    Pack size 25 mg
    Substance name (1S,2R)-1-benzyl-3-dimethylamino-2-methyl-1-phenylpropyl acetate
    CAS Number 33318-28-4
    Quantitative No
    Current batch 2646
    QTY (Max 25)

  • Search result 3

    Category Number 1059
    Pack size 20 mg
    Substance name (2-amino-5-nitrophenyl)(2-chlorophenyl)methanone
    CAS Number 2011-66-7
    Quantitative No
    Current batch 3532
    QTY (Max 25)

  • Search result 4

    Category Number 531
    Pack size 25 mg
    Substance name (2-butylbenzofuran-3-yl)(4-hydroxy-3,5-diiodophenyl)methanone
    CAS Number 1951-26-4
    Quantitative No
    Current batch 3777
    QTY (Max 25)

  • Search result 5

    Category Number 888
    Pack size 25 mg
    Substance name (5RS)-3-(2-hydroxyphenyl)-5-phenylcyclohex-2-enone
    CAS Number 15156-56-6
    Quantitative No
    Current batch 3170
    QTY (Max 25)

  • Search result 6

    Category Number 602
    Pack size 25 mg
    Substance name (E)-4-amino-2-ethylidenebutyric acid hydrochloride
    CAS Number 1379403-11-8
    Quantitative No
    Current batch 1956
    Discontinued

  • Search result 7

    Category Number 441
    Pack size 25 mg
    Substance name 1,4-bis(4-chlorobenzhydryl)piperazine
    CAS Number 346451-15-8
    Quantitative No
    Current batch 4513
    QTY (Max 25)

  • Search result 8

    Category Number 456
    Pack size 50 mg
    Substance name 1,5-dimethylhexyl(methyl)amine
    CAS Number 503-00-4
    Quantitative No
    Current batch 1647
    QTY (Max 25)

  • Search result 9

    Category Number 721
    Pack size 25 mg
    Substance name 1-(2,5-dichlorophenyl)-5-isopropylbiguanide hydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch 2381
    QTY (Max 25)

  • Search result 10

    Category Number 232
    Pack size 25 mg
    Substance name 1-(2-methoxyphenyl)piperazine
    CAS Number Not applicable
    Quantitative No
    Current batch 1589
    E-mail to order:  bpcrs@mhra.gov.uk

  • Search result 11

    Category Number 955
    Pack size 25 mg
    Substance name 1-(4-chlorophenyl)-1-phenylethanol
    CAS Number 59767-24-7
    Quantitative No
    Current batch 4288
    QTY (Max 25)

  • Search result 12

    Category Number 609
    Pack size 50 mg
    Substance name 1-benzyl-1H-indazol-3-ol
    CAS Number 2215-63-6
    Quantitative No
    Current batch 3940
    QTY (Max 25)

  • Search result 13

    Category Number 611
    Pack size 50 mg
    Substance name 1-benzyl-3-(3-diethylamino-propoxy)-1H-indazole
    CAS Number 47448-66-8
    Quantitative No
    Current batch 4085
    QTY (Max 25)

  • Search result 14

    Category Number 481
    Pack size 25 mg
    Substance name 1-hydroxy-9-anthrone
    CAS Number 1715-81-7
    Quantitative No
    Current batch 2181
    QTY (Max 25)

  • Search result 15

    Category Number 476
    Pack size 25 mg
    Substance name 1-methyl-3-[2-(5-methylimidazol-4-yl-methylthio)ethyl]guanidine dihydrochloride
    CAS Number 59660-24-1
    Quantitative No
    Current batch 2992
    QTY (Max 25)

  • Search result 16

    Category Number 605
    Pack size 25 mg
    Substance name 1-methyl-4-(2-benzoylhydrazino)azepan hydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch 2051
    Discontinued

  • Search result 17

    Category Number 606
    Pack size 25 mg
    Substance name 1-methylazepan-4-one hydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch
    Discontinued

  • Search result 18

    Category Number 1118
    Pack size 15 mg
    Substance name 1-methylpiperazine
    CAS Number 109-01-3
    Quantitative No
    Current batch 3573
    QTY (Max 25)

  • Search result 19

    Category Number 35
    Pack size 50 mg
    Substance name 1-phenyl-3-pyrrolidinopropan-1-one hydrochloride
    CAS Number 833-86-3
    Quantitative No
    Current batch 4265
    QTY (Max 25)

  • Search result 20

    Category Number 49
    Pack size 25 mg
    Substance name 17β,17'β-bis{3-[bis(2-chloroethyl)carbamoyloxy]estra1,3,5,(10)-trienyl}pyrophosphate
    CAS Number Not applicable
    Quantitative No
    Current batch 4229
    Discontinued

  • Search result 21

    Category Number 364
    Pack size 25 mg
    Substance name 2,2-dimethyl-5-(2,4-xylyloxy)valeric acid
    CAS Number Not applicable
    Quantitative No
    Current batch 2599
    E-mail to order:  bpcrs@mhra.gov.uk

  • Search result 22

    Category Number 122
    Pack size 50 mg
    Substance name 2,3-dihydro-6-phenylimidazo[2,1,b]-thiazole
    CAS Number 4335-28-8
    Quantitative No
    Current batch 4480
    QTY (Max 25)

  • Search result 23

    Category Number 526
    Pack size 100 mg
    Substance name 2-(2-hydroxyethyl)-1-methylpyrrolidine
    CAS Number 67004-64-2
    Quantitative No
    Current batch 4112
    QTY (Max 25)

  • Search result 24

    Category Number 77
    Pack size 25 mg
    Substance name 2-(6-chlorothymoxy)ethyldimethylamine hydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch
    Discontinued

  • Search result 25

    Category Number 194
    Pack size 25 mg
    Substance name 2-(6-hydroxythymoxy)ethyldimethylamine hydrochloride
    CAS Number 16809-53-3
    Quantitative No
    Current batch 2040
    QTY (Max 25)

  • Search result 26

    Category Number 46
    Pack size 25 mg
    Substance name 2-(biphenyl-4-yl)propionic acid
    CAS Number 6341-72-6
    Quantitative No
    Current batch 3069
    QTY (Max 25)

  • Search result 27

    Category Number 417
    Pack size 50 mg
    Substance name 2-amino-1-(4-nitrophenyl)propane-1,3-diol
    CAS Number 716-61-0
    Quantitative No
    Current batch 4163
    QTY (Max 25)

  • Search result 28

    Category Number 12
    Pack size 50 mg
    Substance name 2-amino-4,6-dichlorophenol hydrochloride
    CAS Number 5959-39-7
    Quantitative No
    Current batch 4794
    QTY (Max 25)

  • Search result 29

    Category Number 813
    Pack size 25 mg
    Substance name 2-amino-5-chloropyridine
    CAS Number 1072-98-6
    Quantitative No
    Current batch 4503
    QTY (Max 25)

  • Search result 30

    Category Number 24
    Pack size 50 mg
    Substance name 2-azahypoxanthine
    CAS Number 7151-03-3
    Quantitative No
    Current batch 3147
    QTY (Max 25)

  • Search result 31

    Category Number 613
    Pack size 25 mg
    Substance name 2-bromobenzyldimethylamine hydrochloride
    CAS Number Not applicable
    Quantitative No
    Current batch 2420
    QTY (Max 25)

  • Search result 32

    Category Number 477
    Pack size 25 mg
    Substance name 2-carbamoyl-1-methyl-3-[2-(5-methylimidazol-4-ylmethylthio)ethyl]guanidine dihydrochloride
    CAS Number 52568-80-6
    Quantitative No
    Current batch 3332
    QTY (Max 25)

  • Search result 33

    Category Number 559
    Pack size 25 mg
    Substance name 2-chlorothioxanthone
    CAS Number 86-39-5
    Quantitative No
    Current batch 1846
    QTY (Max 25)

  • Search result 34

    Category Number 79
    Pack size 25 mg
    Substance name 2-chlorotritanol
    CAS Number 66774-02-5
    Quantitative No
    Current batch 4333
    QTY (Max 25)

  • Search result 35

    Category Number 478
    Pack size 25 mg
    Substance name 2-cyano-1-methyl-3-[2-(5-methylimidazol-4-ylmethylsulfinyl)ethyl]guanidine
    CAS Number 54237-72-8
    Quantitative No
    Current batch 4034
    QTY (Max 25)

  • Search result 36

    Category Number 361
    Pack size 25 mg
    Substance name 2-diethylaminoethyl-3-(1-naphthyl)-2-(1-naphthylmethyl)propionate oxalate
    CAS Number 115025-99-5
    Quantitative No
    Current batch 4180
    QTY (Max 5)

  • Search result 37

    Category Number 244
    Pack size 50 mg
    Substance name 2-methyl-5-nitroimidazole
    CAS Number 696-23-1
    Quantitative No
    Current batch 2809
    QTY (Max 25)

  • Search result 38

    Category Number 457
    Pack size 50 mg
    Substance name 2-methyl-6-methylaminoheptan-2-ol
    CAS Number 4436-89-9
    Quantitative No
    Current batch 1648
    QTY (Max 25)

  • Search result 39

    Category Number 192
    Pack size 25 mg
    Substance name 2-tert-butylamino-1-(4-hydroxy-3-methylphenyl)ethanol
    CAS Number "2-tert-butylamino-1-(4-hydroxy-3-methylphenyl)ethanol" - CAS No. 18910-64-10 / "2-tert-butylamino-1-(4-hydroxy-3-methylphenyl)ethanol sulfate" - CAS No. 2044704-57-4
    Quantitative No
    Current batch 3891
    QTY (Max 25)

  • Search result 40

    Category Number 332
    Pack size 25 mg
    Substance name 2-thymoxyethyldimethylamine hydrochloride
    CAS Number 60439-42-1
    Quantitative No
    Current batch 1778
    QTY (Max 25)

  • Search result 41

    Category Number 555
    Pack size 25 mg
    Substance name 2-trifluoromethylthioxanthone
    CAS Number 1693-28-3
    Quantitative No
    Current batch 4291
    QTY (Max 25)

  • Search result 42

    Category Number 1101
    Pack size 25 mg
    Substance name 2-[4-[(7-chloro-4-quinolinyl)amino]pentyl] amino ethanol
    CAS Number 4298-15-1
    Quantitative No
    Current batch 4393
    QTY (Max 25)

  • Search result 43

    Category Number 341
    Pack size 50 mg
    Substance name 3,5,6-trichloro-2-hydroxybenzoic acid
    CAS Number 40932-60-3
    Quantitative No
    Current batch 4696
    QTY (Max 25)

  • Search result 44

    Category Number 608
    Pack size 25 mg
    Substance name 3-(1,5-dibenzyl-1H-indazole-3-yl)oxypropyldimethylamine hydrochloride
    CAS Number 2196183-71-6
    Quantitative No
    Current batch 4206
    QTY (Max 25)

  • Search result 45

    Category Number 360
    Pack size 25 mg
    Substance name 3-(1-naphthyl)-2-tetrahydrofurfurylpropionic acid
    CAS Number 25379-26-4
    Quantitative No
    Current batch 3314
    QTY (Max 25)

  • Search result 46

    Category Number 124
    Pack size 25 mg
    Substance name 3-(dibenzo[b,e]thiepin-11(6H)-ylidene)-N,N-dimethylaminopropan-1-amine S-oxide hydrochloride
    CAS Number 42046-35-5 (free base)
    Quantitative No
    Current batch 2655
    Discontinued

  • Search result 47

    Category Number 839
    Pack size 25 mg
    Substance name 3-amino-4-(2-chlorophenyl)-6-nitroquinolin-2(1H)-one
    CAS Number 55198-89-5
    Quantitative No
    Current batch 4785
    QTY (Max 25)

  • Search result 48

    Category Number 536
    Pack size 25 mg
    Substance name 3-amino-4-phenoxy-5-sulfamoylbenzoic acid
    CAS Number 28328-54-3
    Quantitative No
    Current batch 4598
    QTY (Max 25)

  • Search result 49

    Category Number 14
    Pack size 50 mg
    Substance name 3-amino-4-propoxybenzoic acid
    CAS Number 59691-14-4
    Quantitative No
    Current batch 3770
    QTY (Max 25)

  • Search result 50

    Category Number 374
    Pack size 50 mg
    Substance name 3-amino-6-chloro-1-methyl-4-phenylquinolin-2(1H)-one
    CAS Number 5220-02-0
    Quantitative No
    Current batch 3959
    QTY (Max 1)

  • Search result 51

    Category Number 601
    Pack size 25 mg
    Substance name 3-aminopent-4-ene-1,1-dicarboxylic acid
    CAS Number Not applicable
    Quantitative No
    Current batch 1955
    Discontinued

  • Search result 52

    Category Number 607
    Pack size 25 mg
    Substance name 3-dimethylaminopropyl 2-benzylaminobenzoate hydrochloride
    CAS Number 2196185-65-4
    Quantitative No
    Current batch 4313
    QTY (Max 25)

  • Search result 53

    Category Number 627
    Pack size 25 mg
    Substance name 3-formylrifamycin SV
    CAS Number 13292-22-3
    Quantitative No
    Current batch 4289
    QTY (Max 25)

  • Search result 54

    Category Number 239
    Pack size 50 mg
    Substance name 3-methyl-2,2-diphenyl-4-piperidino-butyronitrile
    CAS Number Not applicable
    Quantitative No
    Current batch 600
    E-mail to order:  bpcrs@mhra.gov.uk

  • Search result 55

    Category Number 569
    Pack size 25 mg
    Substance name 3-methylflavone-8-carboxylic acid
    CAS Number 3468-01-7
    Quantitative No
    Current batch 1978
    Discontinued

  • Search result 56

    Category Number 570
    Pack size 25 mg
    Substance name 3-methylflavone-8-carboxylic acid ethyl ester
    CAS Number 35888-94-9
    Quantitative No
    Current batch 1979
    Discontinued

  • Search result 57

    Category Number 367
    Pack size 0.1 mL
    Substance name 3-nitroso-3-azabicyclo[3.3.0]octane
    CAS Number Not applicable
    Quantitative No
    Current batch 2235
    Discontinued

  • Search result 58

    Category Number 450
    Pack size 50 mg
    Substance name 3-piperidylpropiophenone hydrochloride
    CAS Number 886-06-6
    Quantitative No
    Current batch 4481
    QTY (Max 25)

  • Search result 59

    Category Number 499
    Pack size 25 mg
    Substance name 4'-(2-isopropylaminoethyl)methanesulfonanilide hydrochloride
    CAS Number 16974-44-0
    Quantitative No
    Current batch 4183
    QTY (Max 25)

  • Search result 60

    Category Number 163
    Pack size 0.5 mL
    Substance name 4'-fluoro-4-chlorobutyrophenone
    CAS Number Not applicable
    Quantitative No
    Current batch 829
    Discontinued

  • Search result 61

    Category Number 770
    Pack size 25 mg
    Substance name 4'-hydroxyacetophenone
    CAS Number 99-93-4
    Quantitative No
    Current batch 2796
    QTY (Max 25)

  • Search result 62

    Category Number 557
    Pack size 100 mg
    Substance name 4'-isobutylacetophenone
    CAS Number 38861-78-8
    Quantitative No
    Current batch 3042
    QTY (Max 5)

  • Search result 63

    Category Number 681
    Pack size 25 mg
    Substance name 4-acetyl-2-fluorobiphenyl
    CAS Number Not applicable
    Quantitative No
    Current batch 2249
    QTY (Max 25)

  • Search result 64

    Category Number 10
    Pack size 50 mg
    Substance name 4-amino-6-chlorobenzene-1,3-disulfonamide
    CAS Number 121-30-2
    Quantitative No
    Current batch 2149
    QTY (Max 25)

  • Search result 65

    Category Number 74
    Pack size 25 mg
    Substance name 4-chloro-5-sulfamoylanthranilic acid
    CAS Number 3086-91-7
    Quantitative No
    Current batch 3767
    QTY (Max 25)

  • Search result 66

    Category Number 604
    Pack size 1
    Substance name 4-chlorobenzylphthalazinone
    CAS Number Not applicable
    Quantitative Not applicable
    Current batch
    Discontinued

  • Search result 67

    Category Number 195
    Pack size 25 mg
    Substance name 4-dimethylamino-3-methyl-1,2-diphenylbutan-2-ol hydrochloride
    CAS Number 2214-28-0
    Quantitative No
    Current batch 2645
    QTY (Max 25)

  • Search result 68

    Category Number 1130
    Pack size 50 mg
    Substance name 4-dodecylresorcinol
    CAS Number 24305-56-4
    Quantitative No
    Current batch 3616
    Discontinued

  • Search result 69

    Category Number 71
    Pack size 25 mg
    Substance name 4-[2-(5-chloro-2-methoxybenzamido)ethyl]benzenesulfonamide
    CAS Number 16673-34-0
    Quantitative No
    Current batch 4161
    QTY (Max 25)

  • Search result 70

    Category Number 359
    Pack size 1
    Substance name 5-(6-methoxy-2-naphthyl)-3-methylcyclohexan-1-one
    CAS Number Not applicable
    Quantitative Not applicable
    Current batch
    Discontinued

  • Search result 71

    Category Number 965
    Pack size 100 mg
    Substance name 5-chloro-1-methyl-4-nitroimidazole
    CAS Number 4897-25-0
    Quantitative No
    Current batch 4252
    QTY (Max 25)

  • Search result 72

    Category Number 378
    Pack size 50 mg
    Substance name 5-chloro-2-methylaminobenzophenone
    CAS Number 1022-13-5
    Quantitative No
    Current batch 3758
    QTY (Max 25)

  • Search result 73

    Category Number 1078
    Pack size 25 mg
    Substance name 5-methoxytryptamine
    CAS Number 608-07-1
    Quantitative No
    Current batch 3395
    QTY (Max 5)

  • Search result 74

    Category Number 564
    Pack size 25 mg
    Substance name 5-vinyl-2-pyrrolidone
    CAS Number 7529-16-0
    Quantitative No
    Current batch 3593
    QTY (Max 25)

  • Search result 75

    Category Number 196
    Pack size 50 mg
    Substance name 5-[1-hydroxy-2-(1-methyl-3-phenylpropylamino)ethyl] salicylic acid hydrochloride
    CAS Number 1391051-99-2 (free base)
    Quantitative No
    Current batch 4186
    QTY (Max 25)

  • Search result 76

    Category Number 582
    Pack size 1
    Substance name 6,6'-dimethoxy-2,2'-binaphthyl
    CAS Number Not applicable
    Quantitative Not applicable
    Current batch
    Discontinued

  • Search result 77

    Category Number 443
    Pack size 25 mg
    Substance name 6-(2-chlorophenyl)-2,4-dihydro-2-[(dimethylamino)methylene]8-nitroimidazo[1,2-a][1,4]benzodiazepin-1-one
    CAS Number Not applicable
    Quantitative No
    Current batch 1509
    QTY (Max 25)

  • Search result 78

    Category Number 442
    Pack size 25 mg
    Substance name 6-chloro-1,4-dihydro-1-methyl-4-phenylquinazolin-4-ol
    CAS Number 52395-03-6
    Quantitative No
    Current batch 3810
    QTY (Max 2)

  • Search result 79

    Category Number 376
    Pack size 50 mg
    Substance name 6-chloro-4-(2-chlorophenyl)quinazoline-2-carboxaldehyde
    CAS Number 93955-15-8
    Quantitative No
    Current batch 4462
    QTY (Max 25)

  • Search result 80

    Category Number 871
    Pack size 50 mg
    Substance name 6-epidoxycycline hydrochloride
    CAS Number 41411-66-9
    Quantitative No
    Current batch 3914
    Discontinued

  • Search result 81

    Category Number 11
    Pack size 20 mg
    Substance name 7-aminodesacetoxycephalosporanic acid
    CAS Number 22252-43-3
    Quantitative No
    Current batch 3109
    QTY (Max 25)

  • Search result 82

    Category Number 470
    Pack size 25 mg
    Substance name 7-chloro-1-5-dihydro-5-phenyl-1,5-benzodiazepine-2,4(3H)-dione
    CAS Number 22316-55-8
    Quantitative No
    Current batch 1588
    Discontinued

  • Search result 83

    Category Number 626
    Pack size 25 mg
    Substance name 8s-isopropyl-3β-hydroxytropanium bromide
    CAS Number Not applicable
    Quantitative No
    Current batch 4230
    QTY (Max 25)

  • Search result 84

    Category Number 560
    Pack size 25 mg
    Substance name 9-allyl-2-chlorothioxanthen-9-ol
    CAS Number 33049-88-6
    Quantitative No
    Current batch 1848
    QTY (Max 25)

  • Search result 85

    Category Number 2
    Pack size 25 mg
    Substance name <N1,N2>-diquinoxalin-2-ylsulphanilamide
    CAS Number Not applicable
    Quantitative No
    Current batch 1455
    Discontinued

  • Search result 86

    Category Number 1114
    Pack size 20 mg
    Substance name abacavir impurity 1
    CAS Number 120503-69-7
    Quantitative No
    Current batch 4748
    QTY (Max 25)

  • Search result 87

    Category Number 1113
    Pack size 10 mg
    Substance name abacavir impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 3766
    QTY (Max 25)

  • Search result 88

    Category Number 1112
    Pack size 100 mg
    Substance name abacavir sulfate
    CAS Number 188062-50-2
    Quantitative Yes
    Current batch 3637
    QTY (Max 25)

  • Search result 89

    Category Number 1172
    Pack size 100 mg
    Substance name acamprosate calcium
    CAS Number 77337-73-6
    Quantitative Yes
    Current batch 3798
    QTY (Max 25)

  • Search result 90

    Category Number 1
    Pack size 50 mg
    Substance name acepromazine maleate
    CAS Number 3598-37-6
    Quantitative No
    Current batch 2608
    QTY (Max 2)

  • Search result 91

    Category Number 904
    Pack size 600 mg
    Substance name acetazolamide
    CAS Number 59-66-5
    Quantitative Yes
    Current batch 4345
    QTY (Max 25)

  • Search result 92

    Category Number 907
    Pack size 200 mg
    Substance name acetylcysteine
    CAS Number 616-91-1
    Quantitative Yes
    Current batch 4501
    QTY (Max 25)

  • Search result 93

    Category Number 438
    Pack size 100 mg
    Substance name aciclovir
    CAS Number 59277-89-3
    Quantitative Yes
    Current batch 4459
    QTY (Max 25)

  • Search result 94

    Category Number 827
    Pack size 100 mg
    Substance name acitretin
    CAS Number 55079-83-9
    Quantitative Yes
    Current batch 2923
    QTY (Max 25)

  • Search result 95

    Category Number 1120
    Pack size 100 mg
    Substance name adapalene
    CAS Number 106685-40-9
    Quantitative Yes
    Current batch 4632
    QTY (Max 25)

  • Search result 96

    Category Number 1121
    Pack size 10 mg
    Substance name adapalene impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 4839
    QTY (Max 25)

  • Search result 97

    Category Number 3
    Pack size 100 mg
    Substance name adrenaline acid tartrate
    CAS Number 51-42-3
    Quantitative Yes
    Current batch 4582
    QTY (Max 25)

  • Search result 98

    Category Number 1251
    Pack size 25 mg
    Substance name adrenaline impurity standard
    CAS Number Not applicable
    Quantitative No
    Current batch 4280
    Out of Stock

  • Search result 99

    Category Number 763
    Pack size 100 mg
    Substance name albendazole
    CAS Number 54965-21-8
    Quantitative Yes
    Current batch 4094
    QTY (Max 25)

  • Search result 100

    Category Number 436
    Pack size 1 g
    Substance name alexandrian senna fruit powder
    CAS Number Not applicable
    Quantitative Yes
    Current batch 4814
    QTY (Max 1)