Skip to content

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

Dehydroxyl Vancomycin-B

Dehydroxyl Vancomycin-B

CAS: 1378999-72-4
Formula: C₆₆H₇₅Cl₂N₉O₂₃
MW: 1433.26 g/mol

VQ-034541

Reference Standard

Deisopropylatrazine chemical structure

Deisopropylatrazine

CAS: 1007-28-9
Formula: C₅H₈ClN₅
MW: 173.6 g/mol

VQ-032586

Reference Standard

Delafloxacin Dimer Impurity chemical structure

Delafloxacin Dimer Impurity

CAS: 1093185-35-3
Formula: C₃₆H₂₄Cl₂F₆N₈O₈
MW: 881.5 g/mol

VQ-025238

Reference Standard

Delamanid Phenyl Epoxide Mesylate (S)-Isomer Impurity chemical structure

Delamanid Phenyl Epoxide Mesylate (S)-Isomer Impurity

CAS: 683276-63-3
Formula: C₁₀H₁₁NO₆S
MW: 273.26 g/mol

VQ-036611

Reference Standard

Delta 2-Cefepime chemical structure

Delta 2-Cefepime

CAS: 88040-25-9
Formula: C₂₃H₃₄N₆O₆S₂
MW: 554.7 g/mol

VQ-024850

Reference Standard

Delta 4 Abiraterone chemical structure

Delta 4 Abiraterone

CAS: 154229-21-7
Formula: C₂₄H₂₉NO
MW: 347.5 g/mol

VQ-021390

Reference Standard

Delta 5-Avenasterol chemical structure

Delta 5-Avenasterol

CAS: 18472-36-1
Formula: C₂₉H₄₈O
MW: 412.7 g/mol

VQ-035871

Reference Standard

Delta 5,6-Testosterone chemical structure

Delta 5,6-Testosterone

CAS: 571-25-5
Formula: C₁₉H₂₈O₂
MW: 288.4 g/mol

VQ-045354

Reference Standard

Delta 7-Stigmasterol chemical structure

Delta 7-Stigmasterol

CAS: 481-19-6
Formula: C₂₉H₄₆O
MW: 410.7 g/mol

VQ-039750

Reference Standard

Delta 9,11 Testosterone Cypionate chemical structure

Delta 9,11 Testosterone Cypionate

CAS: 122651-11-0
Formula: C₂₇H₃₈O₃
MW: 410.6 g/mol

VQ-028300

Reference Standard

Delta 9,11-Testosterone Undecanoate chemical structure

Delta 9,11-Testosterone Undecanoate

CAS: 2241819-49-6
Formula: C₃₀H₄₆O₃
MW: 454.7 g/mol

VQ-028296

Reference Standard

Delta-2-Avermectin B1a chemical structure

Delta-2-Avermectin B1a

CAS: 110415-68-4
Formula: C₄₈H₇₂O₁₄
MW: 873.1 g/mol

VQ-031349

Reference Standard

Delta-7-Natrexone methobromide chemical structure

Delta-7-Natrexone methobromide

CAS: 1027638-96-5
Formula: C₂₁H₂₄BrNO₄
MW: 434.3 g/mol

VQ-026827

Reference Standard

Delta-9,11-Promestriene chemical structure

Delta-9,11-Promestriene

CAS: 2575516-67-3
Formula: C₂₂H₃₀O₂
MW: 326.5 g/mol

VQ-041701

Reference Standard

Delta(9)-Tetrahydrocannabinolic acid chemical structure

Delta(9)-Tetrahydrocannabinolic acid

CAS: 23978-85-0
Formula: C₂₂H₃₀O₄
MW: 358.5 g/mol

VQ-036123

Reference Standard

Delta2-Cefditoren Pivoxil chemical structure

Delta2-Cefditoren Pivoxil

CAS: 148774-47-4
Formula: C₂₅H₂₈N₆O₇S₃
MW: 620.7 g/mol

VQ-036195

Reference Standard

Delta4-Cephalexin Diketopiperazine chemical structure

Delta4-Cephalexin Diketopiperazine

CAS: 65870-52-2
Formula: C₁₆H₁₇N₃O₄S
MW: 347.4 g/mol

VQ-024909

Reference Standard

Deltamethric Acid Chloride chemical structure

Deltamethric Acid Chloride

CAS: 55710-82-2
Formula: C₈H₉Br₂ClO
MW: 316.42 g/mol

VQ-025242

Reference Standard

DEM-3 Desamino Pyridine

DEM-3 Desamino Pyridine

CAS: 1020718-30-2
Formula: C₁₀H₉ClN₂O₂
MW: 224.64 g/mol

In stock

Reference Standard

Demethoxy Curcumin chemical structure

Demethoxy Curcumin

CAS: 22608-11-3
Formula: C₂₀H₁₈O₅
MW: 338.4 g/mol

VQ-025097

Reference Standard

Demethyloleuropein Aglycone

Demethyloleuropein Aglycone

CAS: 113145-68-9
Formula: C₁₈H₂₀O₈
MW: 364.35 g/mol

VQ-040266

Reference Standard

Denitro Tolcapone chemical structure

Denitro Tolcapone

CAS: 1391053-03-4
Formula: C₁₄H₁₂O₃
MW: 228.24 g/mol

VQ-028432

Reference Standard

Deoxy Artemisinin chemical structure

Deoxy Artemisinin

CAS: 72826-63-2
Formula: C₁₅H₂₂O₄
MW: 266.33 g/mol

VQ-024366

Reference Standard

Deoxy Bosentan Impurity chemical structure

Deoxy Bosentan Impurity

CAS: 157415-45-7
Formula: C₂₇H₂₉N₅O₅S
MW: 535.6 g/mol

In stock

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