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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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Reference Standard

Cenobamate Impurity 7 chemical structure

Cenobamate Impurity 7

CAS: 1233712-93-0
Formula: C₁₆H₁₄O₃
MW: 254.28 g/mol

VQ-036220

Reference Standard

Cenobamate S isomer chemical structure

Cenobamate S isomer

CAS: 913088-81-0
Formula: C₁₀H₁₀ClN₅O₂
MW: 267.67 g/mol

VQ-022131

Reference Standard

Cephalexin Diketopiperazine chemical structure

Cephalexin Diketopiperazine

CAS: 59865-11-1
Formula: C₁₆H₁₇N₃O₄S
MW: 347.4 g/mol

VQ-022133

Reference Standard

Cephalexin Diketopiperazine Monoacid chemical structure

Cephalexin Diketopiperazine Monoacid

CAS: 1323247-65-9
Formula: C₁₆H₁₉N₃O₅S
MW: 365.4 g/mol

VQ-024907

Reference Standard

Cephalexin Monohydrate chemical structure

Cephalexin Monohydrate

CAS: 23325-78-2
Formula: C₁₆H₁₉N₃O₅S
MW: 365.4 g/mol

VQ-024904

Reference Standard

Cephalosporanic acid G chemical structure

Cephalosporanic acid G

CAS: 27255-72-7
Formula: C₁₆H₁₆N₂O₄S
MW: 332.4 g/mol

VQ-024908

Reference Standard

Cephalosporin Impurity C chemical structure

Cephalosporin Impurity C

CAS: 61-24-5
Formula: C₁₆H₂₁N₃O₈S
MW: 415.4 g/mol

VQ-024837

Reference Standard

Cephalothin chemical structure

CAS: 153-61-7
Formula: C₁₆H₁₆N₂O₆S₂
MW: 396.4 g/mol

VQ-024834

Reference Standard

Cetirizine 2-oxoethoxy-acetic acid impurity

Cetirizine 2-oxoethoxy-acetic acid impurity

CAS: 1172851-76-1
Formula: C₂₁H₂₃ClN₂O₄
MW: 402.87 g/mol

VQ-037994

Reference Standard

Cetirizine 3-Chloro Impurity chemical structure

Cetirizine 3-Chloro Impurity

CAS: 1232460-31-9
Formula: C₂₁H₂₅ClN₂O₃
MW: 388.9 g/mol

VQ-004624

Reference Standard

Cetirizine 3-Chloro Impurity Dihydrochloride chemical structure

Cetirizine 3-Chloro Impurity Dihydrochloride

CAS: 1232460-29-5
Formula: C₂₁H₂₅ClN₂O₃
MW: 388.9 g/mol

In stock

Reference Standard

Cetirizine Amide chemical structure

Cetirizine Amide

CAS: 83881-37-2
Formula: C₂₁H₂₆ClN₃O₂
MW: 387.9 g/mol

VQ-022136

Reference Standard

Cetirizine Amide Dihydrochloride chemical structure

Cetirizine Amide Dihydrochloride

CAS: 200707-85-3
Formula: C₂₁H₂₈Cl₃N₃O₂
MW: 460.8 g/mol

VQ-029731

Reference Standard

Cetirizine Ethyl Ester Impurity chemical structure

Cetirizine Ethyl Ester Impurity

CAS: 246870-46-2
Formula: C₂₃H₂₉ClN₂O₃
MW: 416.9 g/mol

In stock

Reference Standard

Cetirizine Glycerol Ester Hydrochloride Impurity

Cetirizine Glycerol Ester Hydrochloride Impurity

Formula: C₂₄H₃₁ClN₂O₅.ClH
MW: 499.43 g/mol

VQ-004627

Reference Standard

Cetirizine Glycerol Ester Impurity chemical structure

Cetirizine Glycerol Ester Impurity

CAS: 1243652-36-9
Formula: C₂₄H₃₁ClN₂O₅
MW: 463 g/mol

VQ-004628

Reference Standard

Cetirizine Glycol Ester

Cetirizine Glycol Ester

CAS: 2705552-48-1
Formula: C₂₄H₃₁ClN₂O₄
MW: 446.97 g/mol

VQ-036225

Reference Standard

Cetirizine Impurity 3

Cetirizine Impurity 3

CAS: 83881-35-0
Formula: C₂₁H₂₇N₃O₂
MW: 353.5 g/mol

VQ-047733

Reference Standard

Cetirizine Impurity B (Dihydrochloride) chemical structure

Cetirizine Impurity B (Dihydrochloride)

CAS: 1000690-91-4
Formula: C₁₉H₂₃Cl₃N₂O₂
MW: 417.8 g/mol

VQ-004629

Reference Standard

Cetirizine Impurity D (Dihydrochloride) chemical structure

Cetirizine Impurity D (Dihydrochloride)

CAS: 856841-95-7
Formula: C₃₀H₂₈Cl₂N₂
MW: 487.5 g/mol

VQ-004630

Reference Standard

Cetirizine Impurity E (Dihydrochloride) chemical structure

Cetirizine Impurity E (Dihydrochloride)

CAS: 83881-56-5
Formula: C₂₃H₃₁Cl₃N₂O₄
MW: 505.9 g/mol

VQ-004631

Reference Standard

Cetirizine Impurity F chemical structure

Cetirizine Impurity F

CAS: 83881-53-2
Formula: C₂₁H₂₆N₂O₃
MW: 354.4 g/mol

In stock

Reference Standard

Cetirizine Impurity F (Dihydrochloride) chemical structure

Cetirizine Impurity F (Dihydrochloride)

CAS: 83881-54-3
Formula: C₂₁H₂₈Cl₂N₂O₃
MW: 427.4 g/mol

VQ-004633

Reference Standard

Cetirizine Impurity G chemical structure

Cetirizine Impurity G

CAS: 728948-88-7
Formula: C₁₉H₂₃ClN₂O
MW: 330.8 g/mol

VQ-024913

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