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)