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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

20,060 products · page 173 of 836

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4-Benzyl-2-(1-methylazepan-4-yl)phthalazin-1(2H)-one

CAS: 47491-39-4
Formula: C₂₂H₂₅N₃O
MW: 347.5 g/mol

ZX-028177

4-Benzyl-2-hydroxymorpholin-3-one

CAS: 287930-73-8
Formula: C₁₁H₁₃NO₃
MW: 207.23 g/mol

ZX-041539

4-Benzyloxy-3-nitroacetophenone

CAS: 14347-05-8
Formula: C₁₅H₁₃NO₄
MW: 271.27 g/mol

ZX-035664

4-Benzyloxyindole

CAS: 20289-26-3
Formula: C₁₅H₁₃NO
MW: 223.27 g/mol

ZX-043004

4-Biphenylcarbonyl chloride

CAS: 14002-51-8
Formula: C₁₃H₉ClO
MW: 216.66 g/mol

ZX-045285

4-Borono-L-phenylalanine

CAS: 76410-58-7
Formula: C₉H₁₂BNO₄
MW: 209.01 g/mol

ZX-045994

4-Bromo N-methylaniline

CAS: 6911-87-1
Formula: C₇H₈BrN
MW: 186.05 g/mol

ZX-034467

4-Bromo-1-(1-ethoxyethyl)-1H-pyrazole

CAS: 1024120-52-2
Formula: C₇H₁₁BrN₂O
MW: 219.08 g/mol

ZX-026128

4-Bromo-1-Butene

CAS: 5162-44-7
Formula: C₄H₇Br
MW: 135 g/mol

ZX-031255

4-Bromo-1-chloro-2-(4-fluorobenzyl)benzene

CAS: 1628918-33-1
Formula: C₁₃H₉BrClF
MW: 299.56 g/mol

ZX-029239

4-Bromo-1-chloro-2-[(2-ethoxyphenyl)methyl]benzene

CAS: 1830346-16-1
Formula: C₁₅H₁₄BrClO
MW: 325.63 g/mol

ZX-024138

4-Bromo-2-chlorobenzoic Acid

CAS: 59748-90-2
Formula: C₇H₄BrClO₂
MW: 235.46 g/mol

ZX-031322

4-Bromo-2-fluorobenzaldehyde

CAS: 57848-46-1
Formula: C₇H₄BrFO
MW: 203.01 g/mol

ZX-035452

4-Bromo-2-fluorobenzamide

CAS: 292621-45-5
Formula: C₇H₅BrFNO
MW: 218.02 g/mol

ZX-039111

4-Bromo-2-nitroanisole

CAS: 33696-00-3
Formula: C₇H₆BrNO₃
MW: 232.03 g/mol

ZX-039097

4-Bromo-2-nitrophenol

CAS: 7693-52-9
Formula: C₆H₄BrNO₃
MW: 218 g/mol

ZX-033377

4-Bromo-2-nitropyridin-3-ol

CAS: 1805945-97-4
Formula: C₅H₃BrN₂O₃
MW: 218.99 g/mol

ZX-046008

4-Bromo-3-methoxybenzamide

CAS: 176961-57-2
Formula: C₈H₈BrNO₂
MW: 230.06 g/mol

ZX-047776

4-Bromo-3-methoxybenzonitrile

CAS: 120315-65-3
Formula: C₈H₆BrNO
MW: 212.04 g/mol

ZX-047777

4-Bromobenzonitrile-d4

CAS: 771534-56-6
Formula: C₇H₄BrN
MW: 186.04 g/mol

ZX-046720

4-Bromochlorobenzene-d4

CAS: 134415-42-2
Formula: C₆H₄BrCl
MW: 195.48 g/mol

ZX-046721

4-Bromofluorobenzene-d4

CAS: 50592-31-9
Formula: C₆H₄BrF
MW: 179.02 g/mol

ZX-046722

4-Bromomandelic acid

CAS: 6940-50-7
Formula: C₈H₇BrO₃
MW: 231.04 g/mol

ZX-034877

4-Butoxyphenol

CAS: 122-94-1
Formula: C₁₀H₁₄O₂
MW: 166.22 g/mol

ZX-036016

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