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

Etodolac ethyl ester chemical structure

Etodolac ethyl ester

CAS: 200880-23-5
Formula: C₁₉H₂₅NO₃
MW: 315.4 g/mol

VQ-035090

Reference Standard

Etomidate Acid chemical structure

CAS: 56649-48-0
Formula: C₁₂H₁₂N₂O₂
MW: 216.24 g/mol

VQ-025665

Reference Standard

Etomidate Racemate chemical structure

Etomidate Racemate

CAS: 15301-65-2
Formula: C₁₄H₁₆N₂O₂
MW: 244.29 g/mol

VQ-037154

Reference Standard

Etonogestrel - Impurity C chemical structure

Etonogestrel - Impurity C

CAS: 54024-10-1
Formula: C₂₁H₂₆O₂
MW: 310.4 g/mol

VQ-035249

Reference Standard

Etonogestrel Impurity 2 chemical structure

Etonogestrel Impurity 2

CAS: 1574323-08-2
Formula: C₂₂H₃₂O₃
MW: 344.5 g/mol

VQ-043500

Reference Standard

Etonogestrel Impurity 3 chemical structure

Etonogestrel Impurity 3

CAS: 149438-01-7
Formula: C₂₂H₃₀O₃
MW: 342.5 g/mol

VQ-044507

Reference Standard

Etonogestrel Impurity 5 chemical structure

Etonogestrel Impurity 5

CAS: 946163-53-7
Formula: C₂₄H₃₂O₃
MW: 368.5 g/mol

VQ-030624

Reference Standard

Etoposide Impurity 1 chemical structure

Etoposide Impurity 1

CAS: 89709-04-6
Formula: C₁₆H₂₀O₈
MW: 340.32 g/mol

VQ-044235

Reference Standard

Etoricoxib Impurity 15 chemical structure

Etoricoxib Impurity 15

CAS: 73312-69-3
Formula: C₅H₈ClNO
MW: 133.57 g/mol

In stock

Reference Standard

Etoricoxib Impurity 23 chemical structure

Etoricoxib Impurity 23

CAS: 1810761-43-3
Formula: C₁₅H₁₆N₂O₃S
MW: 304.4 g/mol

VQ-022609

Reference Standard

Etoricoxib Impurity 27 chemical structure

Etoricoxib Impurity 27

CAS: 1352804-27-3
Formula: C₅H₁₀Cl₂N₂
MW: 169.05 g/mol

VQ-045314

Reference Standard

Etoricoxib Impurity 41

Etoricoxib Impurity 41

CAS: 292068-03-2
Formula: C₁₆H₁₆O₅S₂
MW: 352.43 g/mol

In stock

Reference Standard

Etoricoxib impurity 8 chemical structure

Etoricoxib impurity 8

CAS: 1421227-97-5
Formula: C₂₂H₂₀N₂O₄S
MW: 408.5 g/mol

VQ-022611

Reference Standard

Etoricoxib Impurity 9 chemical structure

Etoricoxib Impurity 9

CAS: 859824-65-0
Formula: C₁₃H₁₇NO₃S₂
MW: 299.4 g/mol

VQ-030630

Reference Standard

Etoricoxib Impurity D chemical structure

Etoricoxib Impurity D

CAS: 221615-75-4
Formula: C₁₅H₁₅NO₃S
MW: 289.4 g/mol

In stock

Reference Standard

Etoricoxib impurity J chemical structure

Etoricoxib impurity J

CAS: 646459-45-2
Formula: C₁₉H₁₇ClN₂O₂S
MW: 372.9 g/mol

VQ-022614

Reference Standard

Etoricoxib Impurity-14 (STAGE-1)

Etoricoxib Impurity-14 (STAGE-1)

Formula: C₁₆H₁₆OS₂
MW: 288.43 g/mol

In stock

Reference Standard

Etoricoxib Related Compound A chemical structure

Etoricoxib Related Compound A

CAS: 10297-73-1
Formula: C₉H₁₀O₃S
MW: 198.24 g/mol

In stock

Reference Standard

Etoricoxib Related Compound B chemical structure

Etoricoxib Related Compound B

CAS: 90536-66-6
Formula: C₉H₁₀O₄S
MW: 214.24 g/mol

In stock

Reference Standard

Etravirine 5-Desbromo 6-Chloro Impurity chemical structure

Etravirine 5-Desbromo 6-Chloro Impurity

CAS: 1070377-34-2
Formula: C₂₀H₁₄ClN₅O
MW: 375.8 g/mol

In stock

Reference Standard

Etravirine Desbromo Methyl Ester Impurity

Etravirine Desbromo Methyl Ester Impurity

CAS: 2240161-95-7
Formula: C₂₆H₂₆N₆O₃
MW: 470.52 g/mol

In stock

Reference Standard

Etravirine Impurity 12 chemical structure

Etravirine Impurity 12

CAS: 1706943-59-0
Formula: C₂₀H₁₇BrN₆O₂
MW: 453.3 g/mol

VQ-004942

Reference Standard

Etravirine Impurity 16 chemical structure

Etravirine Impurity 16

CAS: 2240161-92-4
Formula: C₂₅H₂₄BrN₇O₂
MW: 534.4 g/mol

In stock

Reference Standard

Etravirine Impurity 3 chemical structure

Etravirine Impurity 3

CAS: 1398507-09-9
Formula: C₁₁H₇BrClN₅
MW: 324.56 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