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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

Chloromethylcyclohexane chemical structure

Chloromethylcyclohexane

CAS: 1072-95-3
Formula: C₇H₁₃Cl
MW: 132.63 g/mol

VQ-044008

Reference Standard

Chlorophenol red β-D-galactopyranoside sodium salt

Chlorophenol red β-D-galactopyranoside sodium salt

CAS: 99792-50-4
Formula: C₂₅H₂₂Cl₂O₁₀S
MW: 585.4 g/mol

VQ-050621

Reference Standard

Chlorophenylpiperazine chemical structure

Chlorophenylpiperazine

CAS: 13078-15-4
Formula: C₁₀H₁₄Cl₂N₂
MW: 233.13 g/mol

VQ-047755

Reference Standard

Chloropretadalafil chemical structure

Chloropretadalafil

CAS: 171489-59-1
Formula: C₂₂H₁₉ClN₂O₅
MW: 426.8 g/mol

VQ-023821

Reference Standard

Chloroprocaine Impurity 4 chemical structure

Chloroprocaine Impurity 4

CAS: 10367-96-1
Formula: C₁₃H₁₇ClN₂O₄
MW: 300.74 g/mol

VQ-047756

Reference Standard

Chloroquat Bromide

Chloroquat Bromide

CAS: 93199-84-9
Formula: C₉H₂₁BrClN
MW: 258.63 g/mol

VQ-025081

Reference Standard

Chloroquine Related Compound E chemical structure

Chloroquine Related Compound E

CAS: 5428-61-5
Formula: C₁₈H₂₆ClN₃
MW: 319.9 g/mol

VQ-035302

Reference Standard

Chloroquine Related Compound E Oxalate

Chloroquine Related Compound E Oxalate

CAS: 2771193-15-6
Formula: C₁₈H₂₆ClN₃.C₂H₂O₄
MW: 409.91 g/mol

VQ-043864

Reference Standard

Chlorostilbene chemical structure

CAS: 948-99-2
Formula: C₁₄H₁₁Cl
MW: 214.69 g/mol

VQ-047834

Reference Standard

Chlorphenesin Carbamate chemical structure

Chlorphenesin Carbamate

CAS: 886-74-8
Formula: C₁₀H₁₂ClNO₄
MW: 245.66 g/mol

VQ-036256

Reference Standard

Chlorphenesin Carbamate Isomer chemical structure

Chlorphenesin Carbamate Isomer

CAS: 61514-96-3
Formula: C₁₀H₁₂ClNO₄
MW: 245.66 g/mol

VQ-036255

Reference Standard

Chlorpromazine Impurity 3

Chlorpromazine Impurity 3

CAS: 2375606-72-5
Formula: C₂₉H₂₅Cl₂N₃S₂
MW: 550.57 g/mol

VQ-047763

Reference Standard

Chlorpromazine Impurity 7 chemical structure

Chlorpromazine Impurity 7

CAS: 19606-93-0
Formula: C₂₄H₁₆N₂S₂
MW: 396.5 g/mol

VQ-047762

Reference Standard

Chlorpromazine sulfone chemical structure

Chlorpromazine sulfone

CAS: 4337-86-4
Formula: C₁₇H₁₉ClN₂O₂S
MW: 350.9 g/mol

VQ-029753

Reference Standard

Chlorpromazine Sulfone Hydrochloride chemical structure

Chlorpromazine Sulfone Hydrochloride

CAS: 18683-73-3
Formula: C₁₇H₂₀Cl₂N₂O₂S
MW: 387.3 g/mol

VQ-024942

Reference Standard

Chlorpyriphos-methyl chemical structure

Chlorpyriphos-methyl

CAS: 5598-13-0
Formula: C₇H₇Cl₃NO₃PS
MW: 322.5 g/mol

VQ-027234

Reference Standard

Chlortalidone Impurity 9 chemical structure

Chlortalidone Impurity 9

CAS: 5543-24-8
Formula: C₁₄H₉ClO₃
MW: 260.67 g/mol

VQ-047767

Reference Standard

Chlortalidone Sulfochloro Impurity chemical structure

Chlortalidone Sulfochloro Impurity

CAS: 68592-12-1
Formula: C₁₄H₈Cl₂O₅S
MW: 359.2 g/mol

VQ-029761

Reference Standard

Chlortetracycline Hydrochloride chemical structure

Chlortetracycline Hydrochloride

CAS: 64-72-2
Formula: C₂₂H₂₄Cl₂N₂O₈
MW: 515.3 g/mol

VQ-024947

Reference Standard

Chlorthalidone acid methyl ester impurity chemical structure

Chlorthalidone acid methyl ester impurity

CAS: 92433-89-1
Formula: C₁₅H₁₂ClNO₅S
MW: 353.8 g/mol

VQ-029767

Reference Standard

Chlorthalidone Sulfonyl Chloride Impuriy chemical structure

Chlorthalidone Sulfonyl Chloride Impuriy

CAS: 82875-50-1
Formula: C₁₄H₉Cl₂NO₃S
MW: 342.2 g/mol

VQ-029764

Reference Standard

Cholecalciferol Butyrate chemical structure

Cholecalciferol Butyrate

CAS: 31316-20-8
Formula: C₃₁H₅₀O₂
MW: 454.7 g/mol

VQ-022164

Reference Standard

Cholesta-3,5-diene chemical structure

Cholesta-3,5-diene

CAS: 747-90-0
Formula: C₂₇H₄₄
MW: 368.6 g/mol

VQ-027281

Reference Standard

Cholesterol 3-Sulfate Sodium chemical structure

Cholesterol 3-Sulfate Sodium

CAS: 2864-50-8
Formula: C₂₇H₄₅NaO₄S
MW: 488.7 g/mol

VQ-032321

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