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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

Tryptophan Cyclized impurity chemical structure

Tryptophan Cyclized impurity

CAS: 40856-80-2
Formula: C₁₂H₁₁N₃O₂
MW: 229.23 g/mol

VQ-028561

Reference Standard

Tubocurarine Chloride Pentahydrate chemical structure

Tubocurarine Chloride Pentahydrate

CAS: 6989-98-6
Formula: C₃₇H₅₂Cl₂N₂O₁₁
MW: 771.7 g/mol

VQ-042732

Reference Standard

Tucatinib Dimethyl Impurity

Tucatinib Dimethyl Impurity

CAS: 3091639-36-7
Formula: C₂₄H₂₂N₈OS
MW: 470.55 g/mol

In stock

Reference Standard

Tucatinib Hemiethanolate chemical structure

Tucatinib Hemiethanolate

CAS: 1429755-56-5
Formula: C₅₄H₅₄N₁₆O₅
MW: 1007.1 g/mol

VQ-034471

Reference Standard

Tucatinib Nitrophenoxy Pyridine Impurity chemical structure

Tucatinib Nitrophenoxy Pyridine Impurity

CAS: 864244-98-4
Formula: C₁₂H₁₁N₃O₃
MW: 245.23 g/mol

VQ-034472

Reference Standard

Tucatinib thiazolyl impurity chemical structure

Tucatinib thiazolyl impurity

CAS: 937266-01-8
Formula: C₂₆H₂₄N₈OS
MW: 496.6 g/mol

VQ-023941

Reference Standard

Tulathromycin A Diastereomer chemical structure

Tulathromycin A Diastereomer

CAS: 217500-34-0
Formula: C₄₁H₇₉N₃O₁₂
MW: 806.1 g/mol

VQ-028568

Reference Standard

Tulathromycin Impurity 13 chemical structure

Tulathromycin Impurity 13

CAS: 371193-61-2
Formula: C₄₅H₇₄N₂O₁₄
MW: 867.1 g/mol

VQ-034474

Reference Standard

Tulathromycin Impurity B chemical structure

Tulathromycin Impurity B

CAS: 280755-12-6
Formula: C₄₁H₇₉N₃O₁₂
MW: 806.1 g/mol

VQ-028567

Reference Standard

Tulathromycin TA-3 Impurity

Tulathromycin TA-3 Impurity

CAS: 217649-77-9
Formula: C₄₆H₇₆N₂O₁₄
MW: 881.1 g/mol

VQ-042734

Reference Standard

Turpinionoside D chemical structure

Turpinionoside D

CAS: 449742-44-3
Formula: C₁₉H₃₄O₈
MW: 390.5 g/mol

VQ-030581

Reference Standard

Tylosin 3-Acetate chemical structure

Tylosin 3-Acetate

CAS: 63409-10-9
Formula: C₄₈H₇₉NO₁₈
MW: 958.1 g/mol

VQ-042741

Reference Standard

Tylosin B chemical structure

CAS: 11032-98-7
Formula: C₃₉H₆₅NO₁₄
MW: 771.9 g/mol

VQ-042552

Reference Standard

Tylosin D chemical structure

CAS: 1404-48-4
Formula: C₄₆H₇₉NO₁₇
MW: 918.1 g/mol

VQ-042742

Reference Standard

Tylvalosin Tartrate chemical structure

Tylvalosin Tartrate

CAS: 63428-13-7
Formula: C₅₇H₉₃NO₂₅
MW: 1192.3 g/mol

VQ-029015

Reference Standard

Tyramine chemical structure

CAS: 51-67-2
Formula: C₈H₁₁NO
MW: 137.18 g/mol

VQ-032353

Reference Standard

Umeclidinium Bromide Pyridinyl Ketone Impurity chemical structure

Umeclidinium Bromide Pyridinyl Ketone Impurity

CAS: 72034-25-4
Formula: C₁₂H₁₀ClNO
MW: 219.66 g/mol

VQ-042752

Reference Standard

Undecanedioic Acid chemical structure

Undecanedioic Acid

CAS: 1852-04-6
Formula: C₁₁H₂₀O₄
MW: 216.27 g/mol

VQ-024467

Reference Standard

Undecanoic Acid chemical structure

Undecanoic Acid

CAS: 112-37-8
Formula: C₁₁H₂₂O₂
MW: 186.29 g/mol

VQ-039498

Reference Standard

Unithiol chemical structure

CAS: 4076-02-2
Formula: C₃H₇NaO₃S₃
MW: 210.3 g/mol

VQ-040955

Reference Standard

Upadacitinib Cyclized Impurity chemical structure

Upadacitinib Cyclized Impurity

CAS: 1708997-42-5
Formula: C₂₉H₂₉N₅O₄S
MW: 543.6 g/mol

VQ-028583

Reference Standard

Upadacitinib Enantiomer chemical structure

Upadacitinib Enantiomer

CAS: 1310726-59-0
Formula: C₁₇H₁₉F₃N₆O
MW: 380.4 g/mol

VQ-023952

Reference Standard

Upadacitinib Impurity 10 chemical structure

Upadacitinib Impurity 10

CAS: 2304514-69-8
Formula: C₁₆H₂₀BrNO₃
MW: 354.24 g/mol

VQ-034490

Reference Standard

Upadacitinib Methyl Carbamate Impurity chemical structure

Upadacitinib Methyl Carbamate Impurity

CAS: 2408790-02-1
Formula: C₁₅H₁₄N₄O₄S
MW: 346.4 g/mol

VQ-034496

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