Skip to content

Impurities & Reference Standards

API Impurities

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

14,252products

1,516in stock

COA + SDSwith every lot

Reference Standard

Zofenopril Impurity 5 chemical structure

Zofenopril Impurity 5

CAS: 88043-21-4
Formula: C₁₈H₂₅NO₇S
MW: 399.5 g/mol

In stock

Reference Standard

Zofenopril Impurity 6 chemical structure

Zofenopril Impurity 6

CAS: 74407-70-8
Formula: C₁₁H₁₂O₃S
MW: 224.28 g/mol

VQ-043010

Reference Standard

Zofenopril Impurity 8 chemical structure

Zofenopril Impurity 8

CAS: 2748369-12-0
Formula: C₂₂H₂₃NO₄S₂
MW: 429.6 g/mol

VQ-043011

Reference Standard

Zolmitriptan Aminopropanol Impurity chemical structure

Zolmitriptan Aminopropanol Impurity

CAS: 726134-79-8
Formula: C₉H₁₄N₂O
MW: 166.22 g/mol

VQ-034755

Reference Standard

Zolmitriptan Hydrazinylbenzyl Impurity chemical structure

Zolmitriptan Hydrazinylbenzyl Impurity

CAS: 139264-57-6
Formula: C₁₀H₁₄ClN₃O₂
MW: 243.69 g/mol

VQ-043013

Reference Standard

Zolmitriptan Impurity 9 chemical structure

Zolmitriptan Impurity 9

CAS: 339362-86-6
Formula: C₅H₁₀N₂O₂
MW: 130.15 g/mol

In stock

Reference Standard

Zolmitriptan Impurity C chemical structure

Zolmitriptan Impurity C

CAS: 139264-66-7
Formula: C₁₀H₁₀N₂O₄
MW: 222.2 g/mol

VQ-034752

Reference Standard

Zolpidem Carbaldehyde chemical structure

Zolpidem Carbaldehyde

CAS: 400777-11-9
Formula: C₁₆H₁₄N₂O
MW: 250.29 g/mol

VQ-034760

Reference Standard

Zolpidem Impurity 5 chemical structure

Zolpidem Impurity 5

CAS: 14547-80-9
Formula: C₁₃H₁₂N₂O
MW: 212.25 g/mol

VQ-043016

Reference Standard

Zolpidem IV chemical structure

CAS: 768398-03-4
Formula: C₁₇H₁₅N₃
MW: 261.32 g/mol

VQ-044865

Reference Standard

Zolpidem Related Compound C chemical structure

Zolpidem Related Compound C

CAS: 349122-64-1
Formula: C₁₄H₁₄N₂O
MW: 226.27 g/mol

VQ-044867

Reference Standard

Zolpidem Tartrate - Impurity A chemical structure

Zolpidem Tartrate - Impurity A

CAS: 1346600-85-8
Formula: C₁₉H₂₁N₃O
MW: 307.4 g/mol

VQ-034759

Reference Standard

Zolpidic acid chemical structure

CAS: 189005-44-5
Formula: C₁₇H₁₆N₂O₂
MW: 280.32 g/mol

VQ-034761

Reference Standard

Zonisamide N,N-Dimethylformimidamide chemical structure

Zonisamide N,N-Dimethylformimidamide

CAS: 1217201-89-2
Formula: C₁₁H₁₃N₃O₃S
MW: 267.31 g/mol

VQ-024060

Reference Standard

Zopiclone Impurity 2 chemical structure

Zopiclone Impurity 2

CAS: 43200-82-4
Formula: C₁₁H₅ClN₄O₂
MW: 260.63 g/mol

In stock

Reference Standard

Zotepine S-Oxide chemical structure

Zotepine S-Oxide

CAS: 78105-23-4
Formula: C₁₈H₁₈ClNO₂S
MW: 347.9 g/mol

VQ-043019

Reference Standard

Zuclomiphene citrate chemical structure

Zuclomiphene citrate

CAS: 7619-53-6
Formula: C₃₂H₃₆ClNO₈
MW: 598.1 g/mol

VQ-025046

Reference Standard

Zymosterol chemical structure

CAS: 128-33-6
Formula: C₂₇H₄₄O
MW: 384.6 g/mol

VQ-036283

Reference Standard

ZZ1 Trilostane Impurity

ZZ1 Trilostane Impurity

CAS: 89999-17-7
Formula: C₂₀H₂₇NO₂
MW: 313.43 g/mol

In stock

Reference Standard

α-(2,3-Dimethylphenyl)-1-(trityl)-1H-imidazole-4-methanol chemical structure

α-(2,3-Dimethylphenyl)-1-(trityl)-1H-imidazole-4-methanol

CAS: 176721-01-0
Formula: C₃₁H₂₈N₂O
MW: 444.6 g/mol

VQ-026583

Reference Standard

α-[[[2-(4-Methoxyphenyl)-1-methylethyl](phenylmethyl)amino]methyl]-3-nitro-4-(phenylmethoxy)benzenemethanol chemical structure

α-[[[2-(4-Methoxyphenyl)-1-methylethyl](phenylmethyl)amino]methyl]-3-nitro-4-(phenylmethoxy)benzenemethanol

CAS: 43229-67-0
Formula: C₃₂H₃₄N₂O₅
MW: 526.6 g/mol

VQ-037419

Reference Standard

α-Bisabolol Oxide B chemical structure

α-Bisabolol Oxide B

CAS: 26184-88-3
Formula: C₁₅H₂₆O₂
MW: 238.37 g/mol

VQ-044684

Reference Standard

α-Chloro-2',5'-dihydroxyacetophenone chemical structure

α-Chloro-2',5'-dihydroxyacetophenone

CAS: 60912-82-5
Formula: C₈H₇ClO₃
MW: 186.59 g/mol

VQ-031273

Reference Standard

α-Decitabine-3',5'-bis(4-chlorobenzoate) chemical structure

α-Decitabine-3',5'-bis(4-chlorobenzoate)

CAS: 1140891-02-6
Formula: C₂₂H₁₈Cl₂N₄O₆
MW: 505.3 g/mol

VQ-022319

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