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

Mefox chemical structure

CAS: 79573-48-1
Formula: C₂₀H₂₃N₇O₇
MW: 473.4 g/mol

VQ-038014

Reference Standard

Melanin chemical structure

CAS: 8049-97-6
Formula: C₁₈H₁₀N₂O₄
MW: 318.3 g/mol

VQ-032821

Reference Standard

Melanin chemical structure

CAS: 2323070-48-8
Formula: C₁₈H₁₀N₂O₄
MW: 318.3 g/mol

VQ-047344

Reference Standard

Meldonium Impurity C chemical structure

Meldonium Impurity C

CAS: 106966-25-0
Formula: C₇H₁₇BrN₂O₂
MW: 241.13 g/mol

VQ-049114

Reference Standard

Melengestrol Acetate Related Compound B chemical structure

Melengestrol Acetate Related Compound B

CAS: 80097-73-0
Formula: C₂₅H₃₂O₄
MW: 396.5 g/mol

VQ-049035

Reference Standard

Meloxicam - Impurity F chemical structure

Meloxicam - Impurity F

CAS: 118854-48-1
Formula: C₁₃H₁₅NO₅S
MW: 297.33 g/mol

VQ-023055

Reference Standard

Meloxicam N- Methyl Amide Impurity

Meloxicam N- Methyl Amide Impurity

CAS: 1864184-33-7
Formula: C₇H₉N₃O₂S
MW: 199.23 g/mol

In stock

Reference Standard

Melphalan DL-isomer chemical structure

Melphalan DL-isomer

CAS: 531-76-0
Formula: C₁₃H₁₈Cl₂N₂O₂
MW: 305.2 g/mol

VQ-049037

Reference Standard

Melphalan Ethyl Ester hydrochloride chemical structure

Melphalan Ethyl Ester hydrochloride

CAS: 97470-99-0
Formula: C₁₅H₂₃Cl₃N₂O₂
MW: 369.7 g/mol

VQ-038296

Reference Standard

Melphalan Impurity 20

Melphalan Impurity 20

CAS: 2210294-68-9
Formula: C₁₃H₁₆N₂O₆
MW: 296.28 g/mol

VQ-038298

Reference Standard

Melphalan Impurity 21 chemical structure

Melphalan Impurity 21

CAS: 74713-96-5
Formula: C₁₈H₁₆N₂O₄
MW: 324.3 g/mol

VQ-044581

Reference Standard

Melphalan Isopropyl Ester chemical structure

Melphalan Isopropyl Ester

CAS: 104874-57-9
Formula: C₁₆H₂₄Cl₂N₂O₂
MW: 347.3 g/mol

VQ-026596

Reference Standard

Melphalan Isopropyl Ester Hydrochloride chemical structure

Melphalan Isopropyl Ester Hydrochloride

CAS: 757234-98-3
Formula: C₁₆H₂₅Cl₃N₂O₂
MW: 383.7 g/mol

VQ-031778

Reference Standard

Melphalan Methyl Ester Hydrochloride chemical structure

Melphalan Methyl Ester Hydrochloride

CAS: 62978-52-3
Formula: C₁₄H₂₁Cl₃N₂O₂
MW: 355.7 g/mol

VQ-026593

Reference Standard

Melphalan Racemic Mixture chemical structure

Melphalan Racemic Mixture

CAS: 1465-26-5
Formula: C₁₃H₁₉Cl₃N₂O₂
MW: 341.7 g/mol

VQ-038299

Reference Standard

Memantine Glycine chemical structure

Memantine Glycine

CAS: 1340545-88-1
Formula: C₁₄H₂₃NO₂
MW: 237.34 g/mol

VQ-035006

Reference Standard

Memantine lactose adduct chemical structure

Memantine lactose adduct

CAS: 1159637-28-1
Formula: C₂₄H₄₁NO₁₀
MW: 503.6 g/mol

VQ-026599

Reference Standard

Memantine Related Compound H chemical structure

Memantine Related Compound H

CAS: 15210-60-3
Formula: C₁₃H₂₄ClN
MW: 229.79 g/mol

VQ-026605

Reference Standard

Memantine Related Compound I chemical structure

Memantine Related Compound I

CAS: 80121-67-1
Formula: C₁₂H₂₂ClN
MW: 215.76 g/mol

VQ-026604

Reference Standard

Menadione 2,3 - epoxide chemical structure

Menadione 2,3 - epoxide

CAS: 15448-59-6
Formula: C₁₁H₈O₃
MW: 188.18 g/mol

VQ-041470

Reference Standard

Menaquinone 6 chemical structure

CAS: 84-81-1
Formula: C₄₁H₅₆O₂
MW: 580.9 g/mol

VQ-034669

Reference Standard

Menaquinone-4 chemical structure

CAS: 863-61-6
Formula: C₃₁H₄₀O₂
MW: 444.6 g/mol

VQ-028731

Reference Standard

Menaquinone-7 chemical structure

CAS: 2124-57-4
Formula: C₄₆H₆₄O₂
MW: 649 g/mol

VQ-034668

Reference Standard

Menthofuran chemical structure

CAS: 494-90-6
Formula: C₁₀H₁₄O
MW: 150.22 g/mol

VQ-032406

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