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Active pharmaceutical ingredient (API) impurities for research

All products contained in this category are intended for laboratory use only, and are not meant for human consumption.

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products per page. 4808 products on this category.

BrandProduct dataPurityPrice rangeEstimated delivery
USP logo
Cyclopentylpropanoic Acid (3-Cyclopentylpropanoic acid)
REF: 45-1156167
CAS: 140-77-2
- - -187.00 €Fri 28 Feb 25
USP logo
Ethopabate Related Compound A (Methyl-4-acetamido-2-hydroxybenzoate)
REF: 45-1262823
CAS: 4093-28-1
- - -823.00 €Fri 28 Feb 25
USP logo
Trandolapril Related Compound A ((2S,3aR,7aS)-1-[N-[(S)-1-carboxy-3-phenylpropyl]-L-alanyl]hexahydro-2-indolinecarboxylic acid 1-methyl ester)
REF: 45-1672698
- - -581.00 €Fri 28 Feb 25
USP logo
Nifedipine Nitrosophenylpyridine Analog (Dimethyl 4-(2-nitrosophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate)
REF: 45-1463701
CAS: 50428-14-3
- - -1,511.00 €Fri 28 Feb 25
USP logo
Azithromycin Related Compound H (3'-N-{[4-(Acetylamino)phenyl]sulfonyl}-3'-N-demethylazithromycin)
REF: 45-1046023
CAS: 612069-30-4
- - -1,477.00 €Fri 28 Feb 25
USP logo
Ranolazine Related Compound C (N-(2,6-Dimethylphenyl)-2-(piperazin-1-yl)acetamide)
REF: 45-1598777
CAS: 5294-61-1
- - -1,477.00 €Fri 28 Feb 25
USP logo
Lomustine Related Compound B (1-(2-Chloroethyl)-3-cyclohexylurea)
REF: 45-1369431
CAS: 13908-11-7
- - -1,537.00 €Fri 28 Feb 25
USP logo
Paliperidone Related Compound A (3-Ethyl-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-α]pyrimidin-4-one)
REF: 45-1491818
CAS: 849903-79-3
- - -1,292.00 €Fri 28 Feb 25
USP logo
Enalapril Related Compound D ((S)-Ethyl 2-[(3S,8aS)-3-methyl-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4-phenylbutanoate)
REF: 45-1235332
CAS: 115729-52-7
- - -1,292.00 €Fri 28 Feb 25
USP logo
Triamterene Related Compound B (2,7-diamino-4-hydroxy-6-phenylpteridine)
REF: 45-1680029
CAS: 19375-89-4
- - -1,531.00 €Fri 28 Feb 25
USP logo
Buspirone Related Compound G (1,4-Di(pyrimidin-2-yl)piperazine)
REF: 45-1078813
CAS: 84746-24-7
- - -1,477.00 €Fri 28 Feb 25
USP logo
Raloxifene Related Compound C (1-(2-{4-[6-hydroxy-2-(4-hydroxyphenyl)benzothiophene-3-carbonyl]phenoxy}ethyl)piperidine 1-oxide monohydrate)
REF: 45-1598234
CAS: 195454-31-0
- - -1,371.00 €Fri 28 Feb 25
USP logo
Ciclopirox Related Compound A (3-Cyclohexyl-4,5-dihydro-5-methyl-5-isoxazolyl acetic acid)
REF: 45-1134029
- - -1,552.00 €Fri 28 Feb 25
USP logo
Clopidogrel Related Compound A ((+)-(S)-(o-chlorophenyl)-6,7-dihydrothieno[3,2-c]pyridine-5(4H)-acetic acid, hydrochloride)
REF: 45-1140586
CAS: 144750-42-5
- - -1,663.00 €Fri 28 Feb 25
USP logo
Acyclovir Related Compound A (2-[(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl acetate)
REF: 45-1012076
CAS: 102728-64-3
- - -1,390.00 €Fri 28 Feb 25
USP logo
Phenoxybenzamine Alcohol (2-[Benzyl(1-phenoxypropan-2-yl)amino]ethan-1-ol)
REF: 45-1525999
CAS: 101-45-1
- - -1,583.00 €Fri 28 Feb 25
USP logo
Olanzapine Related Compound C (2-Methyl-4-(4-methylpiperazin-1-yl)-10H-benzo[b]thieno[2,3-e][1,4]diazepine 4'-N-oxide)
REF: 45-1478334
CAS: 174794-02-6
- - -1,371.00 €Fri 28 Feb 25
USP logo
Theophylline Related Compound D (N-Methyl-5-(methylamino)-1H-imidazole-4-carboxamide hydrochloride monohydrate)
REF: 45-1653048
- - -1,552.00 €Fri 28 Feb 25
USP logo
Tinidazole Related Compound A (2-methyl-5-nitroimidazole)
REF: 45-1667530
CAS: 696-23-1
- - -1,477.00 €Fri 28 Feb 25
USP logo
Thimerosal Related Compound A (2,2'-Disulfanediyldibenzoic acid)
REF: 45-1659001
CAS: 119-80-2
- - -1,441.00 €Fri 28 Feb 25
discount label

Cyclopentylpropanoic Acid (3-Cyclopentylpropanoic acid)


Ref: 45-1156167

25mg187.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Ethopabate Related Compound A (Methyl-4-acetamido-2-hydroxybenzoate)


Ref: 45-1262823

25mg823.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Trandolapril Related Compound A ((2S,3aR,7aS)-1-[N-[(S)-1-carboxy-3-phenylpropyl]-L-alanyl]hexahydro-2-indolinecarboxylic acid 1-methyl ester)


Ref: 45-1672698

25mg581.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Nifedipine Nitrosophenylpyridine Analog (Dimethyl 4-(2-nitrosophenyl)-2,6-dimethylpyridine-3,5-dicarboxylate)


Ref: 45-1463701

25mg1,511.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Azithromycin Related Compound H (3'-N-{[4-(Acetylamino)phenyl]sulfonyl}-3'-N-demethylazithromycin)


Ref: 45-1046023

15mg1,477.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Ranolazine Related Compound C (N-(2,6-Dimethylphenyl)-2-(piperazin-1-yl)acetamide)


Ref: 45-1598777

50mg1,477.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Lomustine Related Compound B (1-(2-Chloroethyl)-3-cyclohexylurea)


Ref: 45-1369431

25mg1,537.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Paliperidone Related Compound A (3-Ethyl-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-α]pyrimidin-4-one)


Ref: 45-1491818

20mg1,292.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Enalapril Related Compound D ((S)-Ethyl 2-[(3S,8aS)-3-methyl-1,4-dioxohexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl]-4-phenylbutanoate)


Ref: 45-1235332

25mg1,292.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Triamterene Related Compound B (2,7-diamino-4-hydroxy-6-phenylpteridine)


Ref: 45-1680029

50mg1,531.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Buspirone Related Compound G (1,4-Di(pyrimidin-2-yl)piperazine)


Ref: 45-1078813

50mg1,477.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Raloxifene Related Compound C (1-(2-{4-[6-hydroxy-2-(4-hydroxyphenyl)benzothiophene-3-carbonyl]phenoxy}ethyl)piperidine 1-oxide monohydrate)


Ref: 45-1598234

20mg1,371.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Ciclopirox Related Compound A (3-Cyclohexyl-4,5-dihydro-5-methyl-5-isoxazolyl acetic acid)


Ref: 45-1134029

25mg1,552.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Clopidogrel Related Compound A ((+)-(S)-(o-chlorophenyl)-6,7-dihydrothieno[3,2-c]pyridine-5(4H)-acetic acid, hydrochloride)


Ref: 45-1140586

20mg1,663.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Acyclovir Related Compound A (2-[(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethyl acetate)


Ref: 45-1012076

50mg1,390.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Phenoxybenzamine Alcohol (2-[Benzyl(1-phenoxypropan-2-yl)amino]ethan-1-ol)


Ref: 45-1525999

50mg1,583.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Olanzapine Related Compound C (2-Methyl-4-(4-methylpiperazin-1-yl)-10H-benzo[b]thieno[2,3-e][1,4]diazepine 4'-N-oxide)


Ref: 45-1478334

5mg1,371.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Theophylline Related Compound D (N-Methyl-5-(methylamino)-1H-imidazole-4-carboxamide hydrochloride monohydrate)


Ref: 45-1653048

30mg1,552.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Tinidazole Related Compound A (2-methyl-5-nitroimidazole)


Ref: 45-1667530

100mg1,477.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
discount label

Thimerosal Related Compound A (2,2'-Disulfanediyldibenzoic acid)


Ref: 45-1659001

50mg1,441.00 €
Estimated delivery in United States, on Friday 28 Feb 2025
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