Pharmaceutical Impurity Reference Standards - Fountainbridge

Pharmaceutical Impurity Reference Standards

Fountainbridge are experts in the custom synthesis of pharmaceutical impurity reference standards and metabolite reference standards. We have successfully synthesised a large number of impurities on scales of milligrams to hundreds of grams. We excel in challenging syntheses and all our materials come with a detailed certificate of analysis. Please search our products below or contact us to request a quote

Fountainbridge is a leading global supplier of custom synthesised pharmaceutical impurity reference standards. Please Contact Us for a custom synthesis quotation for these or any other products of interest.

4-Epi Doxycycline

(4R,4aR,5S,5aR,6R,12aS)-4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenecarboxamide

Abacavir Impurity 1

N6-Cyclopropyl-9H-purine-2,6-diamine

2-Amino-6-cyclopropylamino-9H-purine

Abacavir Related Compound A

Abacavir EP Impurity C

Descyclopropyl Abacavir

Alvimopan D5 Metabolite

(αS,3R,4R)-4-(3-Hydroxyphenyl)-3,4-dimethyl-α-(phenylmethyl-d5)-1-piperidinepropanoic acid

Amiodarone Related Compound D

Amiodarone EP Impurity D

2-Butyl-3-(3,5-diiodo-4-hydroxybenzoyl)benzofuran

Amoxicillin alpha penicilloic acid

(4S)-2-[{[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino}(carboxy)methyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid

Amoxicillin Dimer Impurity

Amoxicillin dimer (penicilloic form)

2-(4-Hydroxyphenyl)glycyl-2-[4-carboxy-5,5-dimethyl-2-thiazolidinyl]glycyl-N-[2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-6-yl]-2-(4-hydroxyphenyl)glycinamide

Anastrozole Impurity A

Didestriazole Anastrozole Dimer Impurity

α1-[[3-(1-Cyano-1-methylethyl)-5-methylphenyl]methyl]-α1,α3,α3,5-tetramethyl-1,3-benzenediacetonitrile

Atorvastatin (3S,5R) Impurity

Atorvastatin USP Related Compound B

(3S,5R)-Atorvastatin calcium salt

Atorvastatin (3S,5S) Impurity

Atorvastatin Related Compound E

(3S,5S)-Atorvastatin calcium salt

Benzydamine Hydrochloride Impurity A

3-(dimethylamino)propyl 2-(benzylamino)benzoate hydrochloride

Benzydamine Hydrochloride Impurity B

3-(1,5-Dibenzyl-1H-indazol-3-yl)oxypropyldimethylamine hydrochloride

Benzydamine Hydrochloride Impurity C

1-benzyl-1H-indazol-3-ol hydrochloride

2215-63-6 (free compound)

Betahistine EP Impurity C Trihydrochloride

N-methyl-2-(pyridin-2-yl)-N-[2-(pyridine-2-yl)ethyl]ethanamine trihydrochloride

5452-87-9 (free compound)

Budesonide EP Impurity L

11-Keto Budesonide

Capecitabine Isomer

Capecitabine Isomer

pentyl {1-[(2S,3R,4S,5R)-3,4-dihydroxy-5-methyloxolan-2-yl]-5-fluoro-2-oxo-1,2-dihydropyrimidin-4-yl}carbamate

Cefepime D8 Sulfate

1-[[(6R,7R)-7-[[(2Z)-(2-Amino-4-thiazolyl)(methoxyimino)acetyl]amino]-2-carboxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]-1-methylpyrrolidinium-D8 sulfate

Ceftriaxone EP Impurity B

3-Desacetyl Cefotaxime Lactone

Ceftriaxone Impurity C

2-methyl-3-sulfanyl-1,2-dihydro-1,2,4-triazine-5,6-dione

Ceftriaxone Impurity D

S-(Benzothiazol-2-yl)(2-Aminothiazol-4-yl)(methoxyimino)thioacetate

Ceftriaxone Impurity E

(6R,7R)-7-Amino-8-oxo-3-[[(1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triazin-3-yl)thio]methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid

Celecoxib-d7 isomer

1-[4-(methanesulfonyl)phenyl]-5-[4-methyl(2H4)phenyl]-3-(trifluoromethyl)-1H-pyrazole

Chlorpromazine impurity D

Demethyl Chlorpromazine Hydrochloride

Cinnarizine Impurity D

1-(Diphenylmethyl)-4-[(1RS,3E)-4-phenyl-1-[(E)-2-phenylethenyl)-3-buten-1-yl]piperazine

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