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

1-(4-(2-(Azepan-1-yl)ethoxy)benzyl)-5-(benzyloxy)-2-(4-(benzyloxy)phenyl)-3-methyl-1H-indole chemical structure

1-(4-(2-(Azepan-1-yl)ethoxy)benzyl)-5-(benzyloxy)-2-(4-(benzyloxy)phenyl)-3-methyl-1H-indole

CAS: 198480-21-6
Formula: C₄₄H₄₆N₂O₃
MW: 650.8 g/mol

VQ-021738

Reference Standard

1-(4-(2-Methoxyethyl)phenoxy)-3-(oxiran-2-ylMethoxy)propan-2-ol chemical structure

1-(4-(2-Methoxyethyl)phenoxy)-3-(oxiran-2-ylMethoxy)propan-2-ol

CAS: 1416440-64-6
Formula: C₁₅H₂₂O₅
MW: 282.33 g/mol

VQ-031858

Reference Standard

1-(4-(2-Methyl-6-oxopiperidin-1-yl)phenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one chemical structure

1-(4-(2-Methyl-6-oxopiperidin-1-yl)phenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one

CAS: 2098457-93-1
Formula: C₂₁H₂₇N₃O₃
MW: 369.5 g/mol

VQ-035759

Reference Standard

1-(4-(3-Bromopropoxy)-3-methoxyphenyl)ethanone chemical structure

1-(4-(3-Bromopropoxy)-3-methoxyphenyl)ethanone

CAS: 3245-49-6
Formula: C₁₂H₁₅BrO₃
MW: 287.15 g/mol

VQ-031164

Reference Standard

1-(4-(4-(((2R,4S)-2-((1H-Imidazol-1-yl)methyl)-2-(2-chlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)ethan-1-one chemical structure

1-(4-(4-(((2R,4S)-2-((1H-Imidazol-1-yl)methyl)-2-(2-chlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)ethan-1-one

CAS: 1334423-12-9
Formula: C₂₆H₂₉ClN₄O₄
MW: 497 g/mol

VQ-026294

Reference Standard

1-(4-(4-(((2R,4S)-2-((1H-Imidazol-1-yl)methyl)-2-(4-chlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)ethan-1-one chemical structure

1-(4-(4-(((2R,4S)-2-((1H-Imidazol-1-yl)methyl)-2-(4-chlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)ethan-1-one

CAS: 91458-32-1
Formula: C₂₆H₂₉ClN₄O₄
MW: 497 g/mol

VQ-026290

Reference Standard

1-(4-(4-(Benzo[b]thiophen-4-yl)piperazin-1-yl)butyl)-7-(4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butoxy)quinolin-2(1H)-one chemical structure

1-(4-(4-(Benzo[b]thiophen-4-yl)piperazin-1-yl)butyl)-7-(4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butoxy)quinolin-2(1H)-one

CAS: 2518081-42-8
Formula: C₃₈H₄₀N₄O₄S
MW: 648.8 g/mol

VQ-036018

Reference Standard

1-(4-(5-Methyl-2-oxopiperidin-1-yl)phenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one chemical structure

1-(4-(5-Methyl-2-oxopiperidin-1-yl)phenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one

CAS: 1686149-78-9
Formula: C₂₁H₂₇N₃O₃
MW: 369.5 g/mol

VQ-021605

Reference Standard

1-(4-(Aminomethyl)naphthalen-1-yl)-N,N-dimethylmethanamine chemical structure

1-(4-(Aminomethyl)naphthalen-1-yl)-N,N-dimethylmethanamine

CAS: 2514708-08-6
Formula: C₁₄H₁₈N₂
MW: 214.31 g/mol

VQ-028286

Reference Standard

1-(4-(Benzo[d]isothiazol-3-yl)piperazin-1-yl)ethan-1-one

1-(4-(Benzo[d]isothiazol-3-yl)piperazin-1-yl)ethan-1-one

CAS: 2327157-90-2
Formula: C₁₃H₁₅N₃OS
MW: 261.3 g/mol

VQ-034748

Reference Standard

1-(4-(Benzyloxy)-3-methoxyphenyl)ethanone chemical structure

1-(4-(Benzyloxy)-3-methoxyphenyl)ethanone

CAS: 1835-11-6
Formula: C₁₆H₁₆O₃
MW: 256.3 g/mol

VQ-028892

Reference Standard

1-(4-(Benzyloxy)-3-nitrophenyl)-2-bromoethanone chemical structure

1-(4-(Benzyloxy)-3-nitrophenyl)-2-bromoethanone

CAS: 43229-01-2
Formula: C₁₅H₁₂BrNO₄
MW: 350.16 g/mol

VQ-024352

Reference Standard

1-(4-(Benzyloxy)phenyl)-2-chloropropan-1-one chemical structure

1-(4-(Benzyloxy)phenyl)-2-chloropropan-1-one

CAS: 111000-54-5
Formula: C₁₆H₁₅ClO₂
MW: 274.74 g/mol

VQ-035112

Reference Standard

1-(4-(Bis(4-Fluorophenyl)methyl)piperazin-1-yl)ethan-1-one chemical structure

1-(4-(Bis(4-Fluorophenyl)methyl)piperazin-1-yl)ethan-1-one

CAS: 857039-69-1
Formula: C₁₉H₂₀F₂N₂O
MW: 330.4 g/mol

VQ-044271

Reference Standard

1-(4-(Chloromethyl)thiazol-2-yl)guanidine chemical structure

1-(4-(Chloromethyl)thiazol-2-yl)guanidine

CAS: 81152-53-6
Formula: C₅H₇ClN₄S
MW: 190.66 g/mol

VQ-030674

Reference Standard

1-(4-(Mercaptomethyl)thiazol-2-yl)guanidine chemical structure

1-(4-(Mercaptomethyl)thiazol-2-yl)guanidine

CAS: 95853-51-3
Formula: C₅H₈N₄S₂
MW: 188.3 g/mol

VQ-048342

Reference Standard

1-(4-Acetylphenyl)-2-methyl-1-propanone chemical structure

1-(4-Acetylphenyl)-2-methyl-1-propanone

CAS: 103931-20-0
Formula: C₁₂H₁₄O₂
MW: 190.24 g/mol

VQ-026114

Reference Standard

1-(4-Amino Phenyl) 4-(4-Methoxy Phenyl) Piperazine chemical structure

1-(4-Amino Phenyl) 4-(4-Methoxy Phenyl) Piperazine

CAS: 74852-62-3
Formula: C₁₇H₂₁N₃O
MW: 283.37 g/mol

VQ-035149

Reference Standard

1-(4-Amino-2-methylbenzoyl)-7-chloro-2,3-dihydro-1H-benzo[b]azepin-5-yl 4-amino-2-methylbenzoate chemical structure

1-(4-Amino-2-methylbenzoyl)-7-chloro-2,3-dihydro-1H-benzo[b]azepin-5-yl 4-amino-2-methylbenzoate

CAS: 1580889-35-5
Formula: C₂₆H₂₄ClN₃O₃
MW: 461.9 g/mol

VQ-034345

Reference Standard

1-(4-Amino-3,5-dichlorophenyl)-2-(tert-butylamino)ethanone hydrochloride chemical structure

1-(4-Amino-3,5-dichlorophenyl)-2-(tert-butylamino)ethanone hydrochloride

CAS: 37845-71-9
Formula: C₁₂H₁₇Cl₃N₂O
MW: 311.6 g/mol

VQ-029838

Reference Standard

1-(4-Aminobenzyl)-1,2,4-triazole chemical structure

1-(4-Aminobenzyl)-1,2,4-triazole

CAS: 119192-10-8
Formula: C₉H₁₀N₄
MW: 174.2 g/mol

VQ-032370

Reference Standard

1-(4-Bromobutyl)-4-(2,3-dichlorophenyl)piperazine chemical structure

1-(4-Bromobutyl)-4-(2,3-dichlorophenyl)piperazine

CAS: 874661-64-0
Formula: C₁₄H₁₉BrCl₂N₂
MW: 366.1 g/mol

VQ-035790

Reference Standard

1-(4-Bromophenyl)-5-methylpyridin-2(1H)-one chemical structure

1-(4-Bromophenyl)-5-methylpyridin-2(1H)-one

CAS: 377756-15-5
Formula: C₁₂H₁₀BrNO
MW: 264.12 g/mol

VQ-033123

Reference Standard

1-(4-Bromophenyl)piperazine chemical structure

1-(4-Bromophenyl)piperazine

CAS: 66698-28-0
Formula: C₁₀H₁₃BrN₂
MW: 241.13 g/mol

VQ-042951

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