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Impurities & Reference Standards

API Impurities

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

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COA + SDSwith every lot

Reference Standard

(S)-N4-(3-Chloro-4-fluorophenyl)-7-((tetrahydrofuran-3-yl)oxy) quinazoline-4,6-diamine chemical structure

(S)-N4-(3-Chloro-4-fluorophenyl)-7-((tetrahydrofuran-3-yl)oxy) quinazoline-4,6-diamine

CAS: 314771-76-1
Formula: C₁₈H₁₆ClFN₄O₂
MW: 374.8 g/mol

VQ-020748

Reference Standard

(S)-N4-(3-chlorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine chemical structure

(S)-N4-(3-chlorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine

CAS: 2413212-09-4
Formula: C₁₈H₁₇ClN₄O₂
MW: 356.8 g/mol

VQ-021445

Reference Standard

(S)-N4-(3,4-Difluorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine chemical structure

(S)-N4-(3,4-Difluorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine

CAS: 2044709-72-8
Formula: C₁₈H₁₆F₂N₄O₂
MW: 358.3 g/mol

VQ-028905

Reference Standard

(S)-N4-(4-Fluorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine chemical structure

(S)-N4-(4-Fluorophenyl)-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine

CAS: 2413212-07-2
Formula: C₁₈H₁₇FN₄O₂
MW: 340.4 g/mol

VQ-028797

Reference Standard

(S)-N4-phenyl-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine

(S)-N4-phenyl-7-((tetrahydrofuran-3-yl)oxy)quinazoline-4,6-diamine

CAS: 2413212-08-3
Formula: C₁₈H₁₈N₄O₂
MW: 322.36 g/mol

VQ-034773

Reference Standard

(S)-N6,N6-dipropyl-4,5,6,7-tetrahydrobenzo[d]thiazole-2,6-diamine chemical structure

(S)-N6,N6-dipropyl-4,5,6,7-tetrahydrobenzo[d]thiazole-2,6-diamine

CAS: 1147937-31-2
Formula: C₈H₁₀N₄O₃S
MW: 242.26 g/mol

VQ-027566

Reference Standard

(S)-Noradrenaline chemical structure

(S)-Noradrenaline

CAS: 149-95-1
Formula: C₈H₁₁NO₃
MW: 169.18 g/mol

VQ-038683

Reference Standard

(S)-Propane-1,2-diamine dihydrochloride chemical structure

(S)-Propane-1,2-diamine dihydrochloride

CAS: 19777-66-3
Formula: C₃H₁₂Cl₂N₂
MW: 147.04 g/mol

VQ-048211

Reference Standard

(S)-Pyrrolidine-2-carbonitrile chemical structure

(S)-Pyrrolidine-2-carbonitrile

CAS: 204387-53-1
Formula: C₅H₈N₂
MW: 96.13 g/mol

VQ-042893

Reference Standard

(S)-Rasagiline chemical structure

CAS: 185517-74-2
Formula: C₁₂H₁₃N
MW: 171.24 g/mol

VQ-004282

Reference Standard

(S)-Rasagiline Mesylate

(S)-Rasagiline Mesylate

CAS: 202464-89-9
Formula: C₁₂H₁₃N.C₂H₆O₃S
MW: 281.37 g/mol

In stock

Reference Standard

(S)-Rotigotine chemical structure

CAS: 99755-59-6
Formula: C₁₉H₂₅NOS
MW: 315.5 g/mol

VQ-004284

Reference Standard

(S)-S-(3-Chloro-2-methyl-3-oxopropyl) ethanethioate chemical structure

(S)-S-(3-Chloro-2-methyl-3-oxopropyl) ethanethioate

CAS: 69570-39-4
Formula: C₆H₉ClO₂S
MW: 180.65 g/mol

VQ-024761

Reference Standard

(S)-Sec-Butyl ((perfluorophenoxy)(phenoxy)phosphoryl)-L-alaninate

(S)-Sec-Butyl ((perfluorophenoxy)(phenoxy)phosphoryl)-L-alaninate

CAS: 1673560-27-4
Formula: C₁₉H₁₉F₅NO₅P
MW: 467.3 g/mol

VQ-044586

Reference Standard

(S)-Sitagliptin N-Boc-Acid Impurity chemical structure

(S)-Sitagliptin N-Boc-Acid Impurity

CAS: 922178-94-7
Formula: C₁₅H₁₈F₃NO₄
MW: 333.3 g/mol

VQ-028056

Reference Standard

(S)-Tenofovir Disoproxil Fumarate chemical structure

(S)-Tenofovir Disoproxil Fumarate

CAS: 1432630-26-6
Formula: C₂₃H₃₄N₅O₁₄P
MW: 635.5 g/mol

VQ-028254

Reference Standard

(S)-tert-Butyl (1-phenylbut-3-en-2-yl)carbamate chemical structure

(S)-tert-Butyl (1-phenylbut-3-en-2-yl)carbamate

CAS: 107202-43-7
Formula: C₁₅H₂₁NO₂
MW: 247.33 g/mol

VQ-035816

Reference Standard

(S)-Tert-Butyl 2,6-dimethyl-3-oxohept-1-en-4-ylcarbamate chemical structure

(S)-Tert-Butyl 2,6-dimethyl-3-oxohept-1-en-4-ylcarbamate

CAS: 247068-81-1
Formula: C₁₄H₂₅NO₃
MW: 255.35 g/mol

VQ-024797

Reference Standard

(S)-tert-Butyl 3-(4-Aminophenyl)piperidine-1-carboxylate chemical structure

(S)-tert-Butyl 3-(4-Aminophenyl)piperidine-1-carboxylate

CAS: 1171197-20-8
Formula: C₁₆H₂₄N₂O₂
MW: 276.37 g/mol

VQ-035363

Reference Standard

(S)-Valiolamine Voglibose chemical structure

(S)-Valiolamine Voglibose

CAS: 1303996-66-8
Formula: C₁₇H₃₄N₂O₁₁
MW: 442.5 g/mol

VQ-034673

Reference Standard

(S)-Zearalanone chemical structure

(S)-Zearalanone

CAS: 5975-78-0
Formula: C₁₈H₂₄O₅
MW: 320.4 g/mol

VQ-042998

Reference Standard

(S)-β-Isopropylphenethylamine chemical structure

(S)-β-Isopropylphenethylamine

CAS: 106498-32-2
Formula: C₁₁H₁₇N
MW: 163.26 g/mol

VQ-022820

Reference Standard

(Stearoyl-2-lyso-sn-glycero-3-phosphocholine) chemical structure

(Stearoyl-2-lyso-sn-glycero-3-phosphocholine)

CAS: 19420-57-6
Formula: C₂₆H₅₄NO₇P
MW: 523.7 g/mol

VQ-032767

Reference Standard

(Trans)-4-Propyl-1-methyl-L-proline chemical structure

(Trans)-4-Propyl-1-methyl-L-proline

CAS: 13380-36-4
Formula: C₉H₁₇NO₂
MW: 171.24 g/mol

VQ-031578

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