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

(2S,3S)-3-((S)-1-((tert-Butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl acetate chemical structure

(2S,3S)-3-((S)-1-((tert-Butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl acetate

CAS: 81275-02-7
Formula: C₁₃H₂₅NO₄Si
MW: 287.43 g/mol

VQ-031176

Reference Standard

(2S,4R)-1-((2S)-5-Guanidino-2-(3-methyl-1,2,3,4-tetrahydroquinoline-8-sulfonamido)pentanoyl)-4-methylpiperidine-2-carboxylic Acid chemical structure

(2S,4R)-1-((2S)-5-Guanidino-2-(3-methyl-1,2,3,4-tetrahydroquinoline-8-sulfonamido)pentanoyl)-4-methylpiperidine-2-carboxylic Acid

CAS: 189264-02-6
Formula: C₂₃H₃₆N₆O₅S
MW: 508.6 g/mol

VQ-043046

Reference Standard

(2S,4R)-5-([1,1'-Biphenyl]-4-yl)-4-((tert-butoxycarbonyl)amino)-2-methylpentanoic Acid chemical structure

(2S,4R)-5-([1,1'-Biphenyl]-4-yl)-4-((tert-butoxycarbonyl)amino)-2-methylpentanoic Acid

CAS: 1012341-54-6
Formula: C₂₃H₂₉NO₄
MW: 383.5 g/mol

VQ-027956

Reference Standard

(2S,4S,5S,6S)-4-Amino-6-methyltetrahydro-2H-pyran-2,5-diol chemical structure

(2S,4S,5S,6S)-4-Amino-6-methyltetrahydro-2H-pyran-2,5-diol

CAS: 746564-84-1
Formula: C₆H₁₃NO₃
MW: 147.17 g/mol

VQ-047973

Reference Standard

(2S,4S,5S)-3-(Tert-Butoxycarbonyl)-2-(4-methoxyphenyl)-4-phenyloxazolidine-5-carboxylic acid chemical structure

(2S,4S,5S)-3-(Tert-Butoxycarbonyl)-2-(4-methoxyphenyl)-4-phenyloxazolidine-5-carboxylic acid

CAS: 153652-67-6
Formula: C₂₂H₂₅NO₆
MW: 399.4 g/mol

VQ-035125

Reference Standard

(2S,4S)-1-(tert-Butoxycarbonyl)-4-(4-(3-methyl-1-phenyl-1H-pyrazol-5-yl)piperazin-1-yl)pyrrolidine-2-carboxylic acid chemical structure

(2S,4S)-1-(tert-Butoxycarbonyl)-4-(4-(3-methyl-1-phenyl-1H-pyrazol-5-yl)piperazin-1-yl)pyrrolidine-2-carboxylic acid

CAS: 1821705-03-6
Formula: C₂₄H₃₃N₅O₄
MW: 455.5 g/mol

VQ-034098

Reference Standard

(2S,4S)-4-Cyclohexyl-1-(3-oxopentanoyl)pyrrolidine-2-carboxylic acid chemical structure

(2S,4S)-4-Cyclohexyl-1-(3-oxopentanoyl)pyrrolidine-2-carboxylic acid

CAS: 149760-14-5
Formula: C₁₆H₂₅NO₄
MW: 295.37 g/mol

VQ-030880

Reference Standard

(2S,4S)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic Acid chemical structure

(2S,4S)-5-(Biphenyl-4-yl)-4-[(tert-butoxycarbonyl)amino]-2-methylpentanoic Acid

CAS: 1012341-52-4
Formula: C₂₃H₂₉NO₄
MW: 383.5 g/mol

VQ-033717

Reference Standard

(2S,4S)-Sacubitril Isomer chemical structure

(2S,4S)-Sacubitril Isomer

CAS: 149709-63-7
Formula: C₂₄H₂₉NO₅
MW: 411.5 g/mol

In stock

Reference Standard

(2S,5R)-(1R,2S,5R)-2-Isopropyl-5-methylcyclohexyl 5-(4-amino-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate chemical structure

(2S,5R)-(1R,2S,5R)-2-Isopropyl-5-methylcyclohexyl 5-(4-amino-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate

CAS: 147126-75-8
Formula: C₁₈H₂₆FN₃O₄S
MW: 399.5 g/mol

VQ-025531

Reference Standard

(2S,5R)-5-[(Phenylmethoxy)amino]-2-piperidinecarboxamide chemical structure

(2S,5R)-5-[(Phenylmethoxy)amino]-2-piperidinecarboxamide

CAS: 1416134-49-0
Formula: C₁₃H₁₉N₃O₂
MW: 249.31 g/mol

VQ-024451

Reference Standard

(2S,5R)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide chemical structure

(2S,5R)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide

CAS: 1192651-49-2
Formula: C₁₄H₁₇N₃O₃
MW: 275.3 g/mol

VQ-024453

Reference Standard

(2S,5R)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid chemical structure

(2S,5R)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid

CAS: 1174020-25-7
Formula: C₁₄H₁₆N₂O₄
MW: 276.29 g/mol

VQ-029307

Reference Standard

(2S,5R)-Ethyl 5-((benzyloxy)amino)piperidine-2-carboxylate Oxalate chemical structure

(2S,5R)-Ethyl 5-((benzyloxy)amino)piperidine-2-carboxylate Oxalate

CAS: 1416134-48-9
Formula: C₁₇H₂₄N₂O₇
MW: 368.4 g/mol

VQ-047499

Reference Standard

(2S,5S) Emtricitabine Menthyl Ester chemical structure

(2S,5S) Emtricitabine Menthyl Ester

CAS: 147027-01-8
Formula: C₁₈H₂₆FN₃O₄S
MW: 399.5 g/mol

VQ-030471

Reference Standard

(2S,5S)-1,6-Diphenylhexane-2,5-diamine chemical structure

(2S,5S)-1,6-Diphenylhexane-2,5-diamine

CAS: 1004316-77-1
Formula: C₁₈H₂₄N₂
MW: 268.4 g/mol

VQ-036432

Reference Standard

(2S,5S)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic Acid chemical structure

(2S,5S)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic Acid

CAS: 2064219-14-1
Formula: C₁₄H₁₆N₂O₄
MW: 276.29 g/mol

VQ-045058

Reference Standard

(2S)-1-(2,4-Difluorophenyl)-2-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-one chemical structure

(2S)-1-(2,4-Difluorophenyl)-2-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-one

CAS: 127001-03-0
Formula: C₁₄H₁₆F₂O₃
MW: 270.27 g/mol

VQ-036904

Reference Standard

(2S)-1-(Chloroacetyl)-2-pyrrolidinecarbonitrile chemical structure

(2S)-1-(Chloroacetyl)-2-pyrrolidinecarbonitrile

CAS: 207557-35-5
Formula: C₇H₉ClN₂O
MW: 172.61 g/mol

VQ-024014

Reference Standard

(2S)-1-Dichloroacetyl-2-pyrrolidinecarbonitrile chemical structure

(2S)-1-Dichloroacetyl-2-pyrrolidinecarbonitrile

CAS: 1803168-09-3
Formula: C₇H₈Cl₂N₂O
MW: 207.05 g/mol

VQ-028708

Reference Standard

(2S)-2-(3-Chloro-2-oxopyrrolidin-1-yl)butanamide chemical structure

(2S)-2-(3-Chloro-2-oxopyrrolidin-1-yl)butanamide

CAS: 2245069-23-0
Formula: C₈H₁₃ClN₂O₂
MW: 204.65 g/mol

VQ-031512

Reference Standard

(2S)-2-[(4S)-2-Oxo-4-propylpyrrolidin-1-yl]butanoic Acid chemical structure

(2S)-2-[(4S)-2-Oxo-4-propylpyrrolidin-1-yl]butanoic Acid

CAS: 2165431-90-1
Formula: C₁₁H₁₉NO₃
MW: 213.27 g/mol

VQ-021891

Reference Standard

(2S)-2-[(Ethoxycarbonyl)amino]-3,3-dimethylbutanoic acid chemical structure

(2S)-2-[(Ethoxycarbonyl)amino]-3,3-dimethylbutanoic acid

CAS: 156990-58-8
Formula: C₉H₁₇NO₄
MW: 203.24 g/mol

VQ-029233

Reference Standard

(2S)-2-Amino-2-phenylethanamide chemical structure

(2S)-2-Amino-2-phenylethanamide

CAS: 6485-52-5
Formula: C₈H₁₀N₂O
MW: 150.18 g/mol

VQ-023391

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