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Impurity Reference Standards

Pharmacopoeial impurities, nitrosamines, metabolites, labelled internal standards and API working standards, each backed by analytical data for method development and QC.

20,060 products6 categories2,050 in stockCOA + SDS with every lot

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Resorcin Acetate

CAS: 102-29-4
Formula: C₈H₈O₃
MW: 152.15 g/mol

ZX-041339

Resveratrol Trimethyl Ether

CAS: 22255-22-7
Formula: C₁₇H₁₈O₃
MW: 270.32 g/mol

ZX-036107

Retapamulin

CAS: 224452-66-8
Formula: C₃₀H₄₇NO₄S
MW: 517.8 g/mol

ZX-032162

Retinol

CAS: 68-26-8
Formula: C₂₀H₃₀O
MW: 286.5 g/mol

ZX-032765

Retrorsine

CAS: 480-54-6
Formula: C₁₈H₂₅NO₆
MW: 351.4 g/mol

ZX-032165

Retrorsine N-Oxide

CAS: 15503-86-3
Formula: C₁₈H₂₅NO₇
MW: 367.4 g/mol

ZX-032166

Revefenacin

CAS: 864750-70-9
Formula: C₃₅H₄₃N₅O₄
MW: 597.7 g/mol

ZX-032167

Revefenacin Ethylamino biphenyl carbamate impurity

CAS: 743460-48-2
Formula: C₂₁H₂₇N₃O₂
MW: 353.5 g/mol

ZX-026693

Revefenacin N-Oxide-1

CAS: 3001303-52-9
Formula: C₃₅H₄₃N₅O₅
MW: 613.7 g/mol

ZX-026695

Revumenib Hydroxymethyl N-Sulfonamide Impurity

CAS: 2169920-32-3
Formula: C₉H₁₉NO₃S
MW: 221.32 g/mol

ZX-047996

Rhein 8-beta-D-Glucuronide

CAS: 70793-10-1
Formula: C₂₁H₁₆O₁₂
MW: 460.3 g/mol

ZX-028958

Rhein 8-Glucoside

CAS: 34298-86-7
Formula: C₂₁H₁₈O₁₁
MW: 446.4 g/mol

ZX-035052

Rhein Acyl-beta-D-glucuronide

CAS: 190605-03-9
Formula: C₂₁H₁₆O₁₂
MW: 460.3 g/mol

ZX-028957

Rhein-13C6

CAS: 1330166-42-1
Formula: C₁₅H₈O₆
MW: 290.18 g/mol

ZX-028959

Rhodanine-3-acetic acid

CAS: 5718-83-2
Formula: C₅H₅NO₃S₂
MW: 191.2 g/mol

ZX-029283

Rhododendrol

CAS: 501-96-2
Formula: C₁₀H₁₄O₂
MW: 166.22 g/mol

ZX-047280

Ribavirin EP Impurity A

CAS: 39925-19-4
Formula: C₈H₁₁N₃O₆
MW: 245.19 g/mol

ZX-022648

Ribavirin EP Impurity B

CAS: 57198-02-4
Formula: C₈H₁₂N₄O₅
MW: 244.2 g/mol

ZX-027725

Ribavirin EP Impurity C

CAS: 4928-87-4
Formula: C₃H₃N₃O₂
MW: 113.08 g/mol

ZX-022646

Ribavirin EP Impurity D

CAS: 3641-08-5
Formula: C₃H₄N₄O
MW: 112.09 g/mol

ZX-026696

Ribavirin EP Impurity F

CAS: 58151-87-4
Formula: C₁₀H₁₄N₄O₆
MW: 286.24 g/mol

ZX-022649

Ribavirin EP Impurity G

CAS: 39030-43-8
Formula: C₈H₁₂N₄O₅
MW: 244.2 g/mol

ZX-022647

Ribavirin Impurity E

CAS: 58151-90-9
Formula: C₁₅H₁₆N₄O₆
MW: 348.31 g/mol

ZX-032897

Ribociclib Chloro Amide Impurity

CAS: 1211443-61-6
Formula: C₁₄H₁₇ClN₄O
MW: 292.76 g/mol

ZX-026698

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