Skip to content

Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,098products

1,516in stock

COA + SDSwith every lot

Reference Standard

Levothyroxine Impurity D (Stage-1) chemical structure

Levothyroxine Impurity D (Stage-1)

CAS: 10463-37-3
Formula: C₈H₆N₂O₇
MW: 242.14 g/mol

In stock

Reference Standard

Levothyroxine Impurity D (Stage-2)

Levothyroxine Impurity D (Stage-2)

CAS: 98879-76-6
Formula: C₉H₈N₂O₇
MW: 256.17 g/mol

In stock

Reference Standard

Levothyroxine Impurity D (Stage-3)

Levothyroxine Impurity D (Stage-3)

CAS: 54291-87-1
Formula: C₁₆H₁₄N₂O₈
MW: 362.29 g/mol

In stock

Reference Standard

Levothyroxine Impurity D (Stage-4)

Levothyroxine Impurity D (Stage-4)

Formula: C₁₆H₁₈N₂O₄
MW: 302.33 g/mol

In stock

Reference Standard

Levothyroxine Impurity D (Stage-5) chemical structure

Levothyroxine Impurity D (Stage-5)

CAS: 54291-88-2
Formula: C₁₆H₁₄I₂O₄
MW: 524.09 g/mol

In stock

Reference Standard

Levothyroxine Impurity D (Stage-6) chemical structure

Levothyroxine Impurity D (Stage-6)

CAS: 1155-40-4
Formula: C₁₄H₁₀I₂O₄
MW: 496.03 g/mol

In stock

Reference Standard

Levothyroxine Methyl Ester chemical structure

Levothyroxine Methyl Ester

CAS: 32180-11-3
Formula: C₁₆H₁₃I₄NO₄
MW: 790.9 g/mol

VQ-043208

Reference Standard

Levothyroxine Monochloro Impurity chemical structure

Levothyroxine Monochloro Impurity

CAS: 909279-46-5
Formula: C₁₅H₁₁ClI₃NO₄
MW: 685.42 g/mol

VQ-034859

Reference Standard

Levothyroxine N-Formyl Impurity chemical structure

Levothyroxine N-Formyl Impurity

CAS: 671235-41-9
Formula: C₁₆H₁₁I₄NO₅
MW: 804.88 g/mol

In stock

Reference Standard

Levothyroxine N-Steric Acid Amide Impurity chemical structure

Levothyroxine N-Steric Acid Amide Impurity

Formula: C₃₃H₄₅I₄NO₅
MW: 1043.3 g/mol

VQ-005194

Reference Standard

Lidamidine Hydrochloride chemical structure

Lidamidine Hydrochloride

CAS: 65009-35-0
Formula: C₁₁H₁₇ClN₄O
MW: 256.73 g/mol

VQ-038025

Reference Standard

Lifitegrast Impurity 14 chemical structure

Lifitegrast Impurity 14

CAS: 2295862-24-5
Formula: C₃₁H₂₈Cl₂N₂O₇S
MW: 643.5 g/mol

VQ-026468

Reference Standard

Lifitegrast Impurity A chemical structure

Lifitegrast Impurity A

CAS: 2271054-95-4
Formula: C₂₀H₂₁Cl₃N₂O₅S
MW: 507.8 g/mol

VQ-038034

Reference Standard

Lifitegrast Impurity D chemical structure

Lifitegrast Impurity D

CAS: 2295862-00-7
Formula: C₂₉H₂₆N₂O₇S
MW: 546.6 g/mol

VQ-031552

Reference Standard

Lifitegrast Impurity F chemical structure

Lifitegrast Impurity F

CAS: 1194550-67-8
Formula: C₃₆H₃₀Cl₂N₂O₇S
MW: 705.6 g/mol

VQ-026469

Reference Standard

Lifitegrast Impurity G chemical structure

Lifitegrast Impurity G

CAS: 2295862-29-0
Formula: C₃₀H₂₆Cl₂N₂O₇S
MW: 629.5 g/mol

VQ-031553

Reference Standard

Lifitegrast R-Isomer chemical structure

Lifitegrast R-Isomer

CAS: 2271299-08-0
Formula: C₂₉H₂₄Cl₂N₂O₇S
MW: 615.5 g/mol

In stock

Reference Standard

Lifitegrast tertiary butyl ester impurity

Lifitegrast tertiary butyl ester impurity

CAS: 2414639-05-5
Formula: C₃₃H₃₂Cl₂N₂O₇S
MW: 671.59 g/mol

VQ-031554

Reference Standard

Ligustilide chemical structure

CAS: 4431-01-0
Formula: C₁₂H₁₄O₂
MW: 190.24 g/mol

VQ-040486

Reference Standard

Linagliptin (N-2) chemical structure

Linagliptin (N-2)

CAS: 2279114-31-5
Formula: C₂₀H₁₈BrN₅O₄
MW: 472.3 g/mol

In stock

Reference Standard

Linagliptin (Stage-I) chemical structure

Linagliptin (Stage-I)

CAS: 21547-96-6
Formula: C₁₀H₁₀BrNO₂
MW: 256.1 g/mol

In stock

Reference Standard

Linagliptin 2-Chloromethyl Impurity chemical structure

Linagliptin 2-Chloromethyl Impurity

CAS: 109113-72-6
Formula: C₁₀H₉ClN₂
MW: 192.64 g/mol

In stock

Reference Standard

Linagliptin 8-Bromo Impurity chemical structure

Linagliptin 8-Bromo Impurity

CAS: 93703-24-3
Formula: C₆H₅BrN₄O₂
MW: 245.03 g/mol

In stock

Reference Standard

Linagliptin Bromo Impurity chemical structure

Linagliptin Bromo Impurity

CAS: 853029-57-9
Formula: C₂₀H₁₇BrN₆O₂
MW: 453.3 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