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.

951 items
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  • Search result 1

    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 2

    Category Number 1101
    Pack size 25 mg
    CAS Number 4298-15-1
    Quantitative No
    Current batch 4393
    QTY (Max 25)
  • Search result 3

    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 4

    Category Number 608
    Pack size 25 mg
    CAS Number 2196183-71-6
    Quantitative No
    Current batch 4206
    QTY (Max 25)
  • Search result 5

    Category Number 360
    Pack size 25 mg
    CAS Number 25379-26-4
    Quantitative No
    Current batch 3314
    QTY (Max 25)
  • Search result 6

    Category Number 124
    Pack size 25 mg
    CAS Number 42046-35-5 (free base)
    Quantitative No
    Current batch 2655
    Discontinued
  • Search result 7

    Category Number 839
    Pack size 25 mg
    CAS Number 55198-89-5
    Quantitative No
    Current batch 4785
    QTY (Max 25)
  • Search result 8

    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 9

    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 10

    Category Number 374
    Pack size 50 mg
    CAS Number 5220-02-0
    Quantitative No
    Current batch 3959
    QTY (Max 1)
  • Search result 11

    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 12

    Category Number 607
    Pack size 25 mg
    CAS Number 2196185-65-4
    Quantitative No
    Current batch 4313
    QTY (Max 25)
  • Search result 13

    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 14

    Category Number 239
    Pack size 50 mg
    CAS Number Not applicable
    Quantitative No
    Current batch 600
    E-mail to order:  bpcrs@mhra.gov.uk
  • Search result 15

    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 16

    Category Number 570
    Pack size 25 mg
    CAS Number 35888-94-9
    Quantitative No
    Current batch 1979
    Discontinued
  • Search result 17

    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 18

    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 19

    Category Number 499
    Pack size 25 mg
    CAS Number 16974-44-0
    Quantitative No
    Current batch 4183
    QTY (Max 25)
  • Search result 20

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