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.

07 August 2025

We are pleased to update that products affected by the recent electrical freezer fault are now available following their temporary withdrawal.

This follows a detailed quality assessment of vialled stock and re-vialing product from our reserved bulk supplies.

Thank you again for your patience while we worked to resolve this matter.

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  • Search result 1

    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 2

    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 3

    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 4

    Category Number 77
    Pack size 25 mg
    CAS Number Not applicable
    Quantitative No
    Current batch
    Discontinued
  • Search result 5

    Category Number 194
    Pack size 25 mg
    CAS Number 16809-53-3
    Quantitative No
    Current batch 2040
    QTY (Max 25)
  • Search result 6

    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 7

    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 8

    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 9

    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 10

    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 11

    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 12

    Category Number 477
    Pack size 25 mg
    CAS Number 52568-80-6
    Quantitative No
    Current batch 3332
    QTY (Max 25)
  • Search result 13

    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 14

    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 15

    Category Number 478
    Pack size 25 mg
    CAS Number 54237-72-8
    Quantitative No
    Current batch 4034
    QTY (Max 25)
  • Search result 16

    Category Number 361
    Pack size 25 mg
    CAS Number 115025-99-5
    Quantitative No
    Current batch 4180
    QTY (Max 5)
  • Search result 17

    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 18

    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 19

    Category Number 192
    Pack size 25 mg
    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 20

    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)