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

Propan-2-yl 4-amino-2-chlorobenzoate chemical structure

Propan-2-yl 4-amino-2-chlorobenzoate

CAS: 59265-81-5
Formula: C₁₀H₁₂ClNO₂
MW: 213.66 g/mol

VQ-029744

Reference Standard

Propane-1,3-diyl bis(4-methylbenzenesulfonate) chemical structure

Propane-1,3-diyl bis(4-methylbenzenesulfonate)

CAS: 5469-66-9
Formula: C₁₇H₂₀O₆S₂
MW: 384.5 g/mol

VQ-048630

Reference Standard

Proparacaine Ethoxy Analog chemical structure

Proparacaine Ethoxy Analog

CAS: 69781-24-4
Formula: C₁₅H₂₅ClN₂O₃
MW: 316.82 g/mol

VQ-033360

Reference Standard

Proparacaine Impurity 2 chemical structure

Proparacaine Impurity 2

CAS: 2815508-81-5
Formula: C₁₃H₁₉NO₅
MW: 269.29 g/mol

VQ-041722

Reference Standard

Proparacaine Impurity 4 chemical structure

Proparacaine Impurity 4

CAS: 100811-81-2
Formula: C₁₃H₂₀Cl₂N₂O₂
MW: 307.21 g/mol

VQ-033361

Reference Standard

Proparacaine impurity B chemical structure

Proparacaine impurity B

CAS: 2518227-82-0
Formula: C₁₉H₃₄ClN₃O₃
MW: 387.9 g/mol

VQ-035344

Reference Standard

Propargyl Benzenesulfonate chemical structure

Propargyl Benzenesulfonate

CAS: 6165-75-9
Formula: C₉H₈O₃S
MW: 196.22 g/mol

VQ-027173

Reference Standard

Propargyl Tosylate chemical structure

Propargyl Tosylate

CAS: 6165-76-0
Formula: C₁₀H₁₀O₃S
MW: 210.25 g/mol

VQ-044712

Reference Standard

Propiconazole-4H-1,2,4-triazole chemical structure

Propiconazole-4H-1,2,4-triazole

CAS: 221132-58-7
Formula: C₁₅H₁₇Cl₂N₃O₂
MW: 342.2 g/mol

VQ-033366

Reference Standard

Propinox Hydrochloride chemical structure

Propinox Hydrochloride

CAS: 2765-97-1
Formula: C₂₁H₂₄ClNO₃
MW: 373.9 g/mol

VQ-033367

Reference Standard

Propiolic Acid chemical structure

CAS: 471-25-0
Formula: C₃H₂O₂
MW: 70.05 g/mol

VQ-032545

Reference Standard

Propionyl glycine chemical structure

Propionyl glycine

CAS: 21709-90-0
Formula: C₅H₉NO₃
MW: 131.13 g/mol

VQ-040187

Reference Standard

Propiophenone chemical structure

CAS: 93-55-0
Formula: C₉H₁₀O
MW: 134.17 g/mol

VQ-027111

Reference Standard

Propiverine Chloro Impurity chemical structure

Propiverine Chloro Impurity

CAS: 118108-64-8
Formula: C₂₀H₂₂ClNO₂
MW: 343.8 g/mol

VQ-041730

Reference Standard

Propiverine Hydrochloride Impurity D chemical structure

Propiverine Hydrochloride Impurity D

CAS: 3608-67-1
Formula: C₂₀H₂₃NO₃
MW: 325.4 g/mol

VQ-041731

Reference Standard

Propofol Impurity 6 chemical structure

Propofol Impurity 6

CAS: 859034-02-9
Formula: C₁₀H₁₂O₃
MW: 180.2 g/mol

In stock

Reference Standard

Propoxydiphenylacetic Acid

Propoxydiphenylacetic Acid

CAS: 47030-01-3
Formula: C₁₇H₁₈O₃
MW: 270.33 g/mol

VQ-033370

Reference Standard

Propoxyphenyl Homohydroxysildenafil chemical structure

Propoxyphenyl Homohydroxysildenafil

CAS: 139755-87-6
Formula: C₂₄H₃₄N₆O₅S
MW: 518.6 g/mol

VQ-043295

Reference Standard

Propoxyphenyl ThiohoMosidenafil chemical structure

Propoxyphenyl ThiohoMosidenafil

CAS: 479073-88-6
Formula: C₂₄H₃₄N₆O₃S₂
MW: 518.7 g/mol

VQ-042162

Reference Standard

Propoxyphenyl-thiohydroxyhomosildenafil chemical structure

Propoxyphenyl-thiohydroxyhomosildenafil

CAS: 479073-90-0
Formula: C₂₄H₃₄N₆O₄S₂
MW: 534.7 g/mol

VQ-043530

Reference Standard

Propranolol Chloro Impurity chemical structure

Propranolol Chloro Impurity

CAS: 47054-95-5
Formula: C₁₆H₂₀ClNO₂
MW: 293.79 g/mol

VQ-005650

Reference Standard

Propranolol Chloro impurity (R-Isomer) chemical structure

Propranolol Chloro impurity (R-Isomer)

CAS: 112805-69-3
Formula: C₁₃H₁₃ClO₂
MW: 236.69 g/mol

VQ-041739

Reference Standard

Propranolol Genotoxic Impurity RS-06 chemical structure

Propranolol Genotoxic Impurity RS-06

CAS: 23916-49-6
Formula: C₆H₁₀Cl₂O₂
MW: 185.05 g/mol

VQ-033378

Reference Standard

Propranolol Impurity A chemical structure

Propranolol Impurity A

CAS: 36112-95-5
Formula: C₁₃H₁₄O₃
MW: 218.25 g/mol

In stock

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