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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

Lercanidipine Ethyl Impurity ((N-1) Stage) chemical structure

Lercanidipine Ethyl Impurity ((N-1) Stage)

CAS: 74936-73-5
Formula: C₁₇H₁₈N₂O₆
MW: 346.3 g/mol

In stock

Reference Standard

Lercanidipine Ethyl Impurity Hydrochloride chemical structure

Lercanidipine Ethyl Impurity Hydrochloride

CAS: 210579-71-8
Formula: C₃₇H₄₄ClN₃O₆
MW: 662.2 g/mol

VQ-005171

Reference Standard

Lercanidipine Impurity 10

Lercanidipine Impurity 10

CAS: 41140-46-9
Formula: C₃₀H₃₁N
MW: 405.57 g/mol

VQ-048842

Reference Standard

Lercanidipine Impurity A chemical structure

Lercanidipine Impurity A

CAS: 74936-74-6
Formula: C₁₉H₂₂N₂O₆
MW: 374.4 g/mol

VQ-026404

Reference Standard

Lercanidipine Impurity E (Freebase) chemical structure

Lercanidipine Impurity E (Freebase)

CAS: 100442-33-9
Formula: C₂₀H₂₇NO
MW: 297.4 g/mol

In stock

Reference Standard

Lercanidipine Impurity Impurity E chemical structure

Lercanidipine Impurity Impurity E

CAS: 39562-17-9
Formula: C₁₂H₁₁NO₅
MW: 249.22 g/mol

VQ-048836

Reference Standard

Lesinurad Bromothiol impurity chemical structure

Lesinurad Bromothiol impurity

CAS: 1158970-76-3
Formula: C₁₅H₁₂BrN₃S
MW: 346.2 g/mol

VQ-031494

Reference Standard

Lesinurad Chloro Impurity chemical structure

Lesinurad Chloro Impurity

CAS: 1533519-98-0
Formula: C₁₇H₁₄ClN₃O₂S
MW: 359.8 g/mol

VQ-037962

Reference Standard

Lesinurad Desbromo Acid Impurity chemical structure

Lesinurad Desbromo Acid Impurity

CAS: 1533519-93-5
Formula: C₁₇H₁₅N₃O₂S
MW: 325.4 g/mol

VQ-037961

Reference Standard

Lesinurad Ethyl ester impurity chemical structure

Lesinurad Ethyl ester impurity

CAS: 1158970-52-5
Formula: C₁₉H₁₈BrN₃O₂S
MW: 432.3 g/mol

VQ-037963

Reference Standard

Letermovir Dialdehyde Impurity chemical structure

Letermovir Dialdehyde Impurity

CAS: 2994645-03-1
Formula: C₂₉H₂₆F₄N₄O₆
MW: 602.5 g/mol

VQ-026409

Reference Standard

Letermovir Ethyl Ester chemical structure

Letermovir Ethyl Ester

CAS: 2758792-79-7
Formula: C₃₁H₃₂F₄N₄O₄
MW: 600.6 g/mol

VQ-022950

Reference Standard

Letermovir Impurity 36

Letermovir Impurity 36

CAS: 2758792-73-1
Formula: C₁₈H₁₄F₄N₂O₄
MW: 398.31 g/mol

VQ-048843

Reference Standard

Letermovir Impurity LTRRC-1 chemical structure

Letermovir Impurity LTRRC-1

CAS: 2991059-71-1
Formula: C₂₉H₂₈F₄N₄O₅
MW: 588.5 g/mol

In stock

Reference Standard

Letermovir Impurity LTRRC-8

Letermovir Impurity LTRRC-8

Formula: C₃₀H₃₀F₄N₄O₄.C₂₀H₁₈O₈.C₄H₈O₂
MW: 1061.03 g/mol

In stock

Reference Standard

Letermovir Methyl Ester chemical structure

Letermovir Methyl Ester

CAS: 917389-29-8
Formula: C₃₀H₃₀F₄N₄O₄
MW: 586.6 g/mol

VQ-026411

Reference Standard

Letermovir N2-Oxide Impurity chemical structure

Letermovir N2-Oxide Impurity

Formula: C₂₉H₂₈F₄N₄O₅
MW: 588.5 g/mol

VQ-005175

Reference Standard

Letrozole Diacid Impurity chemical structure

Letrozole Diacid Impurity

CAS: 1644566-39-1
Formula: C₁₇H₁₃N₃O₄
MW: 323.3 g/mol

VQ-021256

Reference Standard

Letrozole Diamide chemical structure

Letrozole Diamide

CAS: 2170106-13-3
Formula: C₁₇H₁₅N₅O₂
MW: 321.33 g/mol

VQ-022953

Reference Standard

Letrozole Impurity C chemical structure

Letrozole Impurity C

CAS: 112809-25-3
Formula: C₁₀H₈N₄
MW: 184.2 g/mol

VQ-022952

Reference Standard

Letrozole Impurity-D chemical structure

Letrozole Impurity-D

CAS: 10466-37-2
Formula: C₁₅H₁₀N₂
MW: 218.25 g/mol

In stock

Reference Standard

Letrozole Mono-Amide Impurity chemical structure

Letrozole Mono-Amide Impurity

CAS: 2500927-47-7
Formula: C₁₇H₁₃N₅O
MW: 303.32 g/mol

VQ-031500

Reference Standard

Leu-3-Oxytocin chemical structure

CAS: 4294-11-5
Formula: C₄₃H₆₆N₁₂O₁₂S₂
MW: 1007.2 g/mol

VQ-041285

Reference Standard

Leucine Impurity 1

Leucine Impurity 1

CAS: 1867298-88-1
Formula: C₁₀H₁₉NO₄
MW: 217.26 g/mol

VQ-048764

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