Skip to content

Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,098products

1,516in stock

COA + SDSwith every lot

Reference Standard

3-Imino-5-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-2-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidine-1-carbonyl)-5-oxopentanenitrile chemical structure

3-Imino-5-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-2-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidine-1-carbonyl)-5-oxopentanenitrile

CAS: 2102040-00-4
Formula: C₃₂H₄₀N₁₂O₂
MW: 624.7 g/mol

VQ-042584

Reference Standard

3-Iodo-6-nitro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole chemical structure

3-Iodo-6-nitro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole

CAS: 886230-74-6
Formula: C₁₂H₁₂IN₃O₃
MW: 373.15 g/mol

VQ-043873

Reference Standard

3-Isobutyl-1-methyl-4-nitro-1H-pyrazole-5-carboxylic acid chemical structure

3-Isobutyl-1-methyl-4-nitro-1H-pyrazole-5-carboxylic acid

CAS: 1004455-71-3
Formula: C₉H₁₃N₃O₄
MW: 227.22 g/mol

VQ-044017

Reference Standard

3-Isobutylglutaric Anhydride chemical structure

3-Isobutylglutaric Anhydride

CAS: 185815-59-2
Formula: C₉H₁₄O₃
MW: 170.21 g/mol

VQ-033314

Reference Standard

3-Isobutylpentanediamide chemical structure

3-Isobutylpentanediamide

CAS: 1262340-21-5
Formula: C₉H₁₈N₂O₂
MW: 186.25 g/mol

VQ-041647

Reference Standard

3-Isobutylpentanedioic Acid Impurity chemical structure

3-Isobutylpentanedioic Acid Impurity

CAS: 75143-89-4
Formula: C₉H₁₆O₄
MW: 188.22 g/mol

In stock

Reference Standard

3-Isopropyl 5-methyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate chemical structure

3-Isopropyl 5-methyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate

CAS: 39562-82-8
Formula: C₁₉H₂₂N₂O₆
MW: 374.4 g/mol

VQ-037955

Reference Standard

3-Isopropyl 5-methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate chemical structure

3-Isopropyl 5-methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate

CAS: 39562-18-0
Formula: C₁₉H₂₂N₂O₆
MW: 374.4 g/mol

VQ-044370

Reference Standard

3-Isopropylfuran-2,5-dione chemical structure

3-Isopropylfuran-2,5-dione

CAS: 64198-15-8
Formula: C₇H₈O₃
MW: 140.14 g/mol

VQ-041879

Reference Standard

3-Keto Fluvastatin Sodium chemical structure

3-Keto Fluvastatin Sodium

CAS: 1331643-17-4
Formula: C₂₄H₂₃FNNaO₄
MW: 431.4 g/mol

VQ-030849

Reference Standard

3-Keto-5 Alpha-Abiraterone chemical structure

3-Keto-5 Alpha-Abiraterone

CAS: 154229-26-2
Formula: C₂₄H₃₁NO
MW: 349.5 g/mol

VQ-020708

Reference Standard

3-Keto-5-Beta-Abiraterone chemical structure

3-Keto-5-Beta-Abiraterone

CAS: 1940175-99-4
Formula: C₂₄H₃₁NO
MW: 349.5 g/mol

VQ-028986

Reference Standard

3-Keto-N-Propargyl-1-Aminoindan chemical structure

3-Keto-N-Propargyl-1-Aminoindan

CAS: 1312077-05-6
Formula: C₁₂H₁₁NO
MW: 185.22 g/mol

VQ-041841

Reference Standard

3-Methoxy Iminostilbene chemical structure

3-Methoxy Iminostilbene

CAS: 92483-74-4
Formula: C₁₅H₁₃NO
MW: 223.27 g/mol

VQ-034804

Reference Standard

3-Methoxy Morphinan chemical structure

3-Methoxy Morphinan

CAS: 1531-25-5
Formula: C₁₇H₂₃NO
MW: 257.37 g/mol

VQ-030159

Reference Standard

3-Methoxy-2-methyl-4H-pyran-4-one chemical structure

3-Methoxy-2-methyl-4H-pyran-4-one

CAS: 4780-14-7
Formula: C₇H₈O₃
MW: 140.14 g/mol

VQ-032631

Reference Standard

3-Methoxy-2-methylbenzonitrile chemical structure

3-Methoxy-2-methylbenzonitrile

CAS: 77533-17-6
Formula: C₉H₉NO
MW: 147.17 g/mol

VQ-048387

Reference Standard

3-Methoxy-4-(1-methyl-1,2,5,6-tetrahydropyridin-3-yl)-1,2,5-thiadiazole chemical structure

3-Methoxy-4-(1-methyl-1,2,5,6-tetrahydropyridin-3-yl)-1,2,5-thiadiazole

CAS: 131986-29-3
Formula: C₉H₁₃N₃OS
MW: 211.29 g/mol

VQ-034711

Reference Standard

3-Methoxy-N,N,N-trimethylbenzenaminium Methyl Sulfate chemical structure

3-Methoxy-N,N,N-trimethylbenzenaminium Methyl Sulfate

CAS: 39218-17-2
Formula: C₁₁H₁₉NO₅S
MW: 277.34 g/mol

VQ-043242

Reference Standard

3-Methoxyacetanilide chemical structure

3-Methoxyacetanilide

CAS: 588-16-9
Formula: C₉H₁₁NO₂
MW: 165.19 g/mol

VQ-041332

Reference Standard

3-Methoxyphenylacetone chemical structure

3-Methoxyphenylacetone

CAS: 3027-13-2
Formula: C₁₀H₁₂O₂
MW: 164.2 g/mol

VQ-037420

Reference Standard

3-Methyl Cefdinir chemical structure

3-Methyl Cefdinir

CAS: 71091-93-5
Formula: C₁₃H₁₃N₅O₅S₂
MW: 383.4 g/mol

VQ-022069

Reference Standard

3-Methyl Hippuric Acid chemical structure

3-Methyl Hippuric Acid

CAS: 27115-49-7
Formula: C₁₀H₁₁NO₃
MW: 193.2 g/mol

VQ-039133

Reference Standard

3-Methyl-1-(2-(piperidin-1-yl)phenyl)butan-1-imine chemical structure

3-Methyl-1-(2-(piperidin-1-yl)phenyl)butan-1-imine

CAS: 147769-96-8
Formula: C₁₆H₂₄N₂
MW: 244.37 g/mol

VQ-041873

Need a price, a spec or a custom compound?

Send us your list — product names or CAS numbers, grade, quantity and destination. Our team replies with a formal quotation, COA and lead time.

Request a quote Contact sales