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

L-Gluconic acid chemical structure

L-Gluconic acid

CAS: 157663-13-3
Formula: C₆H₁₂O₇
MW: 196.16 g/mol

VQ-043486

Reference Standard

L-Glucono-1,5-lactone chemical structure

L-Glucono-1,5-lactone

CAS: 52153-09-0
Formula: C₆H₁₀O₆
MW: 178.14 g/mol

VQ-026006

Reference Standard

L-Glutamic Acid Dibenzyl Ester Hydrochloride chemical structure

L-Glutamic Acid Dibenzyl Ester Hydrochloride

CAS: 146844-02-2
Formula: C₁₉H₂₂ClNO₄
MW: 363.8 g/mol

VQ-042716

Reference Standard

L-Glutamic Acid Monosodium Salt chemical structure

L-Glutamic Acid Monosodium Salt

CAS: 142-47-2
Formula: C₅H₁₀NNaO₅
MW: 187.13 g/mol

VQ-038956

Reference Standard

L-Hyoscyamine chemical structure

CAS: 101-31-5
Formula: C₁₇H₂₃NO₃
MW: 289.4 g/mol

VQ-031116

Reference Standard

L-Ido Miglustat chemical structure

L-Ido Miglustat

CAS: 305379-00-4
Formula: C₁₀H₂₁NO₄
MW: 219.28 g/mol

VQ-031898

Reference Standard

L-Inosine chemical structure

CAS: 21138-24-9
Formula: C₁₀H₁₂N₄O₅
MW: 268.23 g/mol

VQ-039504

Reference Standard

L-Isoleucine Methyl Ester Hydrochloride chemical structure

L-Isoleucine Methyl Ester Hydrochloride

CAS: 18598-74-8
Formula: C₇H₁₆ClNO₂
MW: 181.66 g/mol

VQ-038090

Reference Standard

L-Lysine S-(Carboxymethyl)-L-Cysteine chemical structure

L-Lysine S-(Carboxymethyl)-L-Cysteine

CAS: 49673-81-6
Formula: C₁₁H₂₃N₃O₆S
MW: 325.38 g/mol

VQ-044239

Reference Standard

L-Lysine-K-DEA (n-1) Impurity

L-Lysine-K-DEA (n-1) Impurity

Formula: C₂₆H₃₅N₃O₅
MW: 469.57 g/mol

In stock

Reference Standard

L-Lysine-K-DEA (n-2) Impurity chemical structure

L-Lysine-K-DEA (n-2) Impurity

CAS: 405-39-0
Formula: C₂₂H₂₆N₂O₆
MW: 414.5 g/mol

In stock

Reference Standard

L-Menthyl 2,2-Dihydroxyacetate chemical structure

L-Menthyl 2,2-Dihydroxyacetate

CAS: 111969-64-3
Formula: C₁₂H₂₂O₄
MW: 230.3 g/mol

VQ-027231

Reference Standard

L-Menthyl Acetate chemical structure

L-Menthyl Acetate

CAS: 2623-23-6
Formula: C₁₂H₂₂O₂
MW: 198.3 g/mol

VQ-039052

Reference Standard

L-Milnacipran Hydrochloride chemical structure

L-Milnacipran Hydrochloride

CAS: 175131-61-0
Formula: C₁₅H₂₃ClN₂O
MW: 282.81 g/mol

VQ-044786

Reference Standard

L-Nal-Lanreotide

L-Nal-Lanreotide

CAS: 205234-49-7
Formula: C₅₄H₆₉N₁₁O₁₀S₂
MW: 1096.3 g/mol

VQ-031433

Reference Standard

L-Norepinephrine Bitartrate Monohydrate chemical structure

L-Norepinephrine Bitartrate Monohydrate

CAS: 108341-18-0
Formula: C₁₂H₁₉NO₁₀
MW: 337.28 g/mol

VQ-026942

Reference Standard

L-Norepinephrine Hydrochloride chemical structure

L-Norepinephrine Hydrochloride

CAS: 329-56-6
Formula: C₈H₁₂ClNO₃
MW: 205.64 g/mol

VQ-035022

Reference Standard

L-Norleucine chemical structure

CAS: 327-57-1
Formula: C₆H₁₃NO₂
MW: 131.17 g/mol

VQ-038900

Reference Standard

L-Ornithine chemical structure

CAS: 70-26-8
Formula: C₅H₁₂N₂O₂
MW: 132.16 g/mol

VQ-027044

Reference Standard

L-Ornithine Dimer chemical structure

L-Ornithine Dimer

CAS: 195868-13-4
Formula: C₁₀H₂₂N₄O₃
MW: 246.31 g/mol

VQ-034997

Reference Standard

L-Ornithyl-L-aspartic Acid chemical structure

L-Ornithyl-L-aspartic Acid

CAS: 7327-72-2
Formula: C₉H₁₇N₃O₅
MW: 247.25 g/mol

VQ-031397

Reference Standard

L-Penicillamine chemical structure

L-Penicillamine

CAS: 1113-41-3
Formula: C₅H₁₁NO₂S
MW: 149.21 g/mol

VQ-041382

Reference Standard

L-Phe(1)-Octreotide

L-Phe(1)-Octreotide

CAS: 109667-07-4
Formula: C₄₉H₆₆N₁₀O₁₀S₂
MW: 1019.24 g/mol

VQ-032229

Reference Standard

L-Primapterin chemical structure

CAS: 2636-52-4
Formula: C₉H₁₁N₅O₃
MW: 237.22 g/mol

VQ-039824

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