Impurity Reference Standards

API Impurities

Process impurities, isomers, degradants and related compounds for thousands of APIs, characterised for method development, validation and QC release.

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Remimazolam S-Isomer Acid Impurity

CAS: 960305-91-3
Formula: C₂₀H₁₇BrN₄O₂
MW: 425.3 g/mol

ZX-032150

Remogliflozin Etabonate

CAS: 442201-24-3
Formula: C₂₆H₃₈N₂O₉
MW: 522.6 g/mol

ZX-026681

Resiniferatoxin

CAS: 57444-62-9
Formula: C₃₇H₄₀O₉
MW: 628.7 g/mol

ZX-035449

Resmetirom Impurity 17

CAS: 1696366-11-6
Formula: C₇H₉ClN₂O
MW: 172.61 g/mol

ZX-005260

Resmetirom Impurity 5

CAS: 920509-28-0
Formula: C₁₃H₁₃Cl₂N₃O₂
MW: 314.16 g/mol

ZX-005261

Resmetirom Impurity 6

CAS: 920509-27-9
Formula: C₁₃H₁₂Cl₃N₃O
MW: 332.6 g/mol

ZX-005262

Resveratrol Trimethyl Ether

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

ZX-036107

Revefenacin Ethylamino biphenyl carbamate impurity

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

ZX-026693

Revumenib Hydroxymethyl N-Sulfonamide Impurity

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

ZX-047996

Rhein 8-Glucoside

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

ZX-035052

Rhodanine-3-acetic acid

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

ZX-029283

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

Ribociclib Impurity 20

CAS: 2481084-18-6
Formula: C₉H₁₁Br₂N₃
MW: 321.01 g/mol

ZX-032178

Ribociclib Impurity 49

CAS: 2250106-77-3
Formula: C₂₆H₃₃N₇O₄
MW: 507.6 g/mol

ZX-005263

Ribociclib Impurity D

CAS: 3060653-14-4
Formula: C₂₇H₃₄N₈O₄
MW: 534.6 g/mol

ZX-005264

Ribociclib Impurity-2

CAS: 2460738-27-4
Formula: C₂₁H₂₉ClN₈O
MW: 445 g/mol

ZX-005265

Ribociclib Methyl Amide Impurity

CAS: 3066072-08-7
Formula: C₂₇H₃₆N₈O₃
MW: 520.6 g/mol

ZX-005266

Ribociclib N-Formyl Impurity

CAS: 2460732-08-3
Formula: C₂₄H₃₀N₈O₂
MW: 462.5 g/mol

ZX-005267

Ribociclib Unknown Impurity-09

CAS: 120613-50-5
Formula: C₁₀H₆Cl₂N₄O
MW: 269.08 g/mol

ZX-005268

Riboflavin-3'-Phosphate

CAS: 80400-93-7
Formula: C₁₇H₂₁N₄O₉P
MW: 456.3 g/mol

ZX-027608

Riboflavin-4'-phosphate

CAS: 60697-29-2
Formula: C₁₇H₂₁N₄O₉P
MW: 456.3 g/mol

ZX-027609

Rifabutin - Impurity D

CAS: 62041-01-4
Formula: C₃₇H₄₇N₃O₁₁
MW: 709.8 g/mol

ZX-026708

Rifampicin Quinone

CAS: 13983-13-6
Formula: C₄₃H₅₆N₄O₁₂
MW: 820.9 g/mol

ZX-026713

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