Impurity Reference Standards

Stable Isotope Labelled Standards (Deuterated, 13C, 15N)

Deuterated, 13C and 15N labelled APIs, metabolites and impurities for use as internal standards in LC-MS bioanalysis and trace testing.

976 productsCOA + SDS with every lot

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4-Chloroaniline D4

CAS: 191656-33-4
Formula: C₆H₆ClN
MW: 131.59 g/mol

ZX-046736

4-Hydroxy-3-methoxybenzaldehyde-d3

CAS: 74495-74-2
Formula: C₈H₈O₃
MW: 155.17 g/mol

ZX-043243

4-Hydroxybenzaldehyde-d4

CAS: 284474-52-8
Formula: C₇H₆O₂
MW: 126.15 g/mol

ZX-033109

4-Hydroxybenzoic acid-13C7

CAS: 287399-28-4
Formula: C₇H₆O₃
MW: 145.07 g/mol

ZX-046421

4-Hydroxybenzoic-2,3,5,6-d4 Acid

CAS: 152404-47-2
Formula: C₇H₆O₃
MW: 142.14 g/mol

ZX-043165

4-Hydroxypyridine-d5

CAS: 45503-33-1
Formula: C₅H₅NO
MW: 100.13 g/mol

ZX-046853

4-Methoxy Estrone-13C,d3

CAS: 1217437-34-7
Formula: C₁₉H₂₄O₃
MW: 304.4 g/mol

ZX-043170

4-Methoxy-[7-13C]-benzoic Acid

CAS: 69838-89-7
Formula: C₈H₈O₃
MW: 153.14 g/mol

ZX-043171

4-Methoxy-d3-benzoic Acid

CAS: 27914-54-1
Formula: C₈H₈O₃
MW: 155.17 g/mol

ZX-042263

4-Methyl-d3 Imidazole

CAS: 1219805-95-4
Formula: C₄H₆N₂
MW: 85.12 g/mol

ZX-043144

4-Methylamino-d3 Antipyrine

CAS: 1246820-06-3
Formula: C₁₂H₁₅N₃O
MW: 220.29 g/mol

ZX-030524

4-Methylumbelliferone-13C4

CAS: 1569304-40-0
Formula: C₁₀H₈O₃
MW: 180.14 g/mol

ZX-031663

4-n-Nonylphenol-2,3,5,6-d4

CAS: 1173019-62-9
Formula: C₁₅H₂₄O
MW: 224.37 g/mol

ZX-044305

4-n-Nonylphenol-2,3,5,6-d4,OD

CAS: 358730-95-7
Formula: C₁₅H₂₄O
MW: 225.38 g/mol

ZX-046908

4-n-Pentyl-d11 -phenol

CAS: 1219805-30-7
Formula: C₁₁H₁₆O
MW: 164.24 g/mol

ZX-046958

4-Nitrobenzaldehyde-d4

CAS: 1020718-72-2
Formula: C₇H₅NO₃
MW: 155.14 g/mol

ZX-043258

4-Nitrobenzonitrile-d4

CAS: 1219798-46-5
Formula: C₇H₄N₂O₂
MW: 152.14 g/mol

ZX-046909

4-Nitrophenol D4

CAS: 93951-79-2
Formula: C₆H₅NO₃
MW: 143.13 g/mol

ZX-042322

4-tert-Octylphenol Diethoxylate-13C6

CAS: 1173020-69-3
Formula: C₁₈H₃₀O₃
MW: 300.38 g/mol

ZX-043261

4-tert-Octylphenol Monoethoxylate-13C6

CAS: 1173019-48-1
Formula: C₁₆H₂₆O₂
MW: 256.33 g/mol

ZX-043262

4,4'-Dipyridyl-d8

CAS: 132125-39-4
Formula: C₁₀H₈N₂
MW: 164.23 g/mol

ZX-046798

4'-Hydroxy Diclofenac-13C6(Contain 3% unlabeled)

CAS: 1189656-64-1
Formula: C₁₄H₁₁Cl₂NO₃
MW: 318.1 g/mol

ZX-043166

4'-Hydroxy Tamoxifen-d6 (contains up to 10% E isomer)

CAS: 1346606-80-1
Formula: C₂₆H₂₉NO₂
MW: 393.5 g/mol

ZX-043169

5-(Methyl-d3)tetrahydrofolic acid

CAS: 1356019-97-0
Formula: C₂₀H₂₅N₇O₆
MW: 462.5 g/mol

ZX-029623

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