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

Ozanimod Hydroxy Amide Impurity chemical structure

Ozanimod Hydroxy Amide Impurity

CAS: 1307230-97-2
Formula: C₁₃H₁₆N₂O₃
MW: 248.28 g/mol

VQ-033019

Reference Standard

Ozenoxacin ETHYL Ester Impurity chemical structure

Ozenoxacin ETHYL Ester Impurity

CAS: 446299-90-7
Formula: C₃₀H₂₉N₃O₄
MW: 495.6 g/mol

VQ-023449

Reference Standard

Ozenoxacin methylester pivalamido impurity

Ozenoxacin methylester pivalamido impurity

CAS: 2767548-42-3
Formula: C₂₇H₃₁N₃O₄
MW: 461.55 g/mol

VQ-041291

Reference Standard

Ozenoxacin Quinoline Ester Impurity chemical structure

Ozenoxacin Quinoline Ester Impurity

CAS: 103877-51-6
Formula: C₁₆H₁₆ClNO₃
MW: 305.75 g/mol

VQ-041293

Reference Standard

Ozenoxacin Quinoline pyridine Ester Impurity

Ozenoxacin Quinoline pyridine Ester Impurity

CAS: 446299-88-3
Formula: C₂₈H₃₃N₃O₄
MW: 475.59 g/mol

VQ-041292

Reference Standard

P-((((R)-1-(6-Amino-9H-purin-9-yl)propan-2-yl)oxy)methyl)-N-((S)-1-isopropoxy-1-oxopropan-2-yl)phosphonamidic Acid chemical structure

P-((((R)-1-(6-Amino-9H-purin-9-yl)propan-2-yl)oxy)methyl)-N-((S)-1-isopropoxy-1-oxopropan-2-yl)phosphonamidic Acid

CAS: 851456-00-3
Formula: C₁₅H₂₅N₆O₅P
MW: 400.37 g/mol

VQ-028262

Reference Standard

p-(2,3-Epoxypropoxy)benzaldehyde chemical structure

p-(2,3-Epoxypropoxy)benzaldehyde

CAS: 14697-49-5
Formula: C₁₀H₁₀O₃
MW: 178.18 g/mol

VQ-029454

Reference Standard

P-[(1R,2R)-1,2-Dihydroxypropyl]-phosphonic Acid Ammonium Salt chemical structure

P-[(1R,2R)-1,2-Dihydroxypropyl]-phosphonic Acid Ammonium Salt

CAS: 1160525-87-0
Formula: C₃H₁₅N₂O₅P
MW: 190.14 g/mol

VQ-025918

Reference Standard

p-Benzyloxypropiophenone chemical structure

p-Benzyloxypropiophenone

CAS: 4495-66-3
Formula: C₁₆H₁₆O₂
MW: 240.3 g/mol

VQ-043934

Reference Standard

p-Chlonixin chemical structure

CAS: 36752-40-6
Formula: C₁₃H₁₁ClN₂O₂
MW: 262.69 g/mol

VQ-026546

Reference Standard

P-Diisopropylbenzene Dihydroperoxide chemical structure

P-Diisopropylbenzene Dihydroperoxide

CAS: 3159-98-6
Formula: C₁₂H₁₈O₄
MW: 226.27 g/mol

VQ-044538

Reference Standard

P-Fluoro Prasugrel Thiolactone chemical structure

P-Fluoro Prasugrel Thiolactone

CAS: 1618107-98-4
Formula: C₁₈H₁₈FNO₂S
MW: 331.4 g/mol

VQ-041595

Reference Standard

p-Isobutylstyrene chemical structure

p-Isobutylstyrene

CAS: 63444-56-4
Formula: C₁₂H₁₆
MW: 160.25 g/mol

VQ-031133

Reference Standard

p-Methoxybenzoyl chloride chemical structure

p-Methoxybenzoyl chloride

CAS: 100-07-2
Formula: C₈H₇ClO₂
MW: 170.59 g/mol

VQ-036828

Reference Standard

P1, P2-Di(Uridine-5')-Diphosphate chemical structure

P1, P2-Di(Uridine-5')-Diphosphate

CAS: 26184-65-6
Formula: C₁₈H₂₄N₄O₁₇P₂
MW: 630.3 g/mol

VQ-035032

Reference Standard

P1, P3-Di(Uridine-5')-Triphosphate chemical structure

P1, P3-Di(Uridine-5')-Triphosphate

CAS: 63785-59-1
Formula: C₁₈H₂₅N₄O₂₀P₃
MW: 710.3 g/mol

VQ-036741

Reference Standard

P1, P5-Di(Uridine-5')-Pentaphosphate chemical structure

P1, P5-Di(Uridine-5')-Pentaphosphate

CAS: 211448-70-3
Formula: C₁₈H₂₇N₄O₂₆P₅
MW: 870.3 g/mol

VQ-025347

Reference Standard

Paclitaxel Derivative C chemical structure

Paclitaxel Derivative C

CAS: 135393-42-9
Formula: C₄₇H₅₃NO₁₅
MW: 871.9 g/mol

VQ-041304

Reference Standard

Paclitaxel Oxetane Ring-Opened 3-Acetyl 4-Benzoyl Impurity chemical structure

Paclitaxel Oxetane Ring-Opened 3-Acetyl 4-Benzoyl Impurity

CAS: 932042-85-8
Formula: C₄₇H₅₃NO₁₅
MW: 871.9 g/mol

VQ-027357

Reference Standard

Paclitaxel Side Chain Impurity chemical structure

Paclitaxel Side Chain Impurity

CAS: 132201-33-3
Formula: C₁₆H₁₅NO₄
MW: 285.29 g/mol

VQ-041295

Reference Standard

Palbociclib 2-Hydroxy Acetyl Impurity chemical structure

Palbociclib 2-Hydroxy Acetyl Impurity

CAS: 2172256-78-7
Formula: C₁₅H₁₇N₃O₃
MW: 287.31 g/mol

In stock

Reference Standard

Palbociclib 2-Hydroxy Bromo Impurity chemical structure

Palbociclib 2-Hydroxy Bromo Impurity

CAS: 1922954-32-2
Formula: C₁₃H₁₄BrN₃O₂
MW: 324.17 g/mol

In stock

Reference Standard

Palbociclib Chlorobromo Impurity chemical structure

Palbociclib Chlorobromo Impurity

CAS: 1016636-76-2
Formula: C₁₃H₁₃BrClN₃O
MW: 342.62 g/mol

In stock

Reference Standard

Palbociclib Dimer Impurity

Palbociclib Dimer Impurity

CAS: 2458234-34-7
Formula: C₄₄H₅₂Br₂N₁₄O₂
MW: 968.8 g/mol

VQ-035197

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