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Impurities & Reference Standards

API Impurities

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

14,252products

1,516in stock

COA + SDSwith every lot

Reference Standard

ent-Efavirenz chemical structure

CAS: 154801-74-8
Formula: C₁₄H₉ClF₃NO₂
MW: 315.67 g/mol

VQ-022492

Reference Standard

Ent-Emtricitabine chemical structure

Ent-Emtricitabine

CAS: 137530-41-7
Formula: C₈H₁₀FN₃O₃S
MW: 247.25 g/mol

VQ-022512

Reference Standard

ent-Entecavir-di-o-benzyl Ether chemical structure

ent-Entecavir-di-o-benzyl Ether

CAS: 1354695-82-1
Formula: C₂₆H₂₇N₅O₃
MW: 457.5 g/mol

VQ-030495

Reference Standard

ent-Epinephrine Impurity 25

ent-Epinephrine Impurity 25

CAS: 2733229-72-4
Formula: C₉H₁₃NO₆S
MW: 263.27 g/mol

VQ-047341

Reference Standard

ent-Letermovir chemical structure

CAS: 917389-37-8
Formula: C₂₉H₂₈F₄N₄O₄
MW: 572.5 g/mol

VQ-026410

Reference Standard

ent-Niraparib chemical structure

CAS: 1038915-58-0
Formula: C₁₉H₂₀N₄O
MW: 320.4 g/mol

VQ-026923

Reference Standard

Ent-Oseltamivir chemical structure

Ent-Oseltamivir

CAS: 1035895-88-5
Formula: C₁₆H₂₈N₂O₄
MW: 312.4 g/mol

VQ-032304

Reference Standard

Ent-Oseltamivir Phosphate chemical structure

Ent-Oseltamivir Phosphate

CAS: 1035895-89-6
Formula: C₁₆H₃₁N₂O₈P
MW: 410.4 g/mol

VQ-038810

Reference Standard

ent-Paroxetine Hydrochloride chemical structure

ent-Paroxetine Hydrochloride

CAS: 130855-30-0
Formula: C₁₉H₂₁ClFNO₃
MW: 365.8 g/mol

VQ-021305

Reference Standard

ent-Paroxol chemical structure

CAS: 389573-45-9
Formula: C₁₃H₁₈FNO
MW: 223.29 g/mol

VQ-033073

Reference Standard

ent-Rosuvastatin Lactone chemical structure

ent-Rosuvastatin Lactone

CAS: 615263-62-2
Formula: C₂₂H₂₆FN₃O₅S
MW: 463.5 g/mol

VQ-033672

Reference Standard

ent-Rosuvastatin tert-Butyl Ester chemical structure

ent-Rosuvastatin tert-Butyl Ester

CAS: 615263-60-0
Formula: C₂₆H₃₆FN₃O₆S
MW: 537.6 g/mol

VQ-027920

Reference Standard

ent-Tedizolid Phosphate chemical structure

ent-Tedizolid Phosphate

CAS: 1835340-19-6
Formula: C₁₇H₁₆FN₆O₆P
MW: 450.3 g/mol

VQ-023844

Reference Standard

Entacapone Amide Impurity chemical structure

Entacapone Amide Impurity

CAS: 158693-01-7
Formula: C₁₀H₇N₃O₅
MW: 249.18 g/mol

VQ-025542

Reference Standard

Entacapone Benzoic Acid Impurity chemical structure

Entacapone Benzoic Acid Impurity

CAS: 84211-30-3
Formula: C₇H₅NO₆
MW: 199.12 g/mol

In stock

Reference Standard

Entecavir Epoxide Impurity chemical structure

Entecavir Epoxide Impurity

CAS: 117641-39-1
Formula: C₁₃H₁₆O₃
MW: 220.26 g/mol

VQ-037006

Reference Standard

Entecavir Impurity 23 chemical structure

Entecavir Impurity 23

CAS: 1354695-86-5
Formula: C₂₆H₂₇N₅O₃
MW: 457.5 g/mol

VQ-037004

Reference Standard

Enzalutamide - Impurity A chemical structure

Enzalutamide - Impurity A

CAS: 112704-79-7
Formula: C₇H₄BrFO₂
MW: 219.01 g/mol

VQ-025548

Reference Standard

Enzalutamide carboxylic acid analogue

Enzalutamide carboxylic acid analogue

CAS: 3035510-37-0
Formula: C₂₁H₁₇F₄N₃O₄S
MW: 483.44 g/mol

VQ-025552

Reference Standard

Enzalutamide Desfluoro Impurity chemical structure

Enzalutamide Desfluoro Impurity

CAS: 915087-16-0
Formula: C₂₁H₁₇F₃N₄O₂S
MW: 446.4 g/mol

In stock

Reference Standard

Enzalutamide Dioxoimidazolidine Impurity chemical structure

Enzalutamide Dioxoimidazolidine Impurity

CAS: 1242137-18-3
Formula: C₂₁H₁₆F₄N₄O₃
MW: 448.4 g/mol

In stock

Reference Standard

Enzalutamide Ethyl Ester Impurity

Enzalutamide Ethyl Ester Impurity

CAS: 2463603-98-5
Formula: C₂₁H₁₉F₄N₃O₃
MW: 437.4 g/mol

VQ-030504

Reference Standard

Enzalutamide Formyl Impurity chemical structure

Enzalutamide Formyl Impurity

CAS: 3035510-40-5
Formula: C₂₁H₁₈F₄N₄O₃
MW: 450.4 g/mol

In stock

Reference Standard

Enzalutamide Impurity (Stage-I)

Enzalutamide Impurity (Stage-I)

Formula: C₂₀H₁₈F₄N₄O₂
MW: 422.38 g/mol

In stock

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