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Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

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Reference Standard

Neostigmine methyl sulphate chemical structure

Neostigmine methyl sulphate

CAS: 51-60-5
Formula: C₁₃H₂₂N₂O₆S
MW: 334.39 g/mol

VQ-026869

Reference Standard

Neotame Impurity 3 chemical structure

Neotame Impurity 3

CAS: 271582-82-2
Formula: C₂₆H₄₀N₂O₅
MW: 460.6 g/mol

VQ-038586

Reference Standard

Nepafenac Impurity B chemical structure

Nepafenac Impurity B

CAS: 78281-61-5
Formula: C₁₆H₁₆N₂O₂S
MW: 300.4 g/mol

VQ-023227

Reference Standard

Nepafenac Impurity B / Monomethyl amide

Nepafenac Impurity B / Monomethyl amide

CAS: 78281-75-1
Formula: C₁₆H₁₆N₂O₂
MW: 268.31 g/mol

VQ-023230

Reference Standard

Nepafenac Impurity C

Nepafenac Impurity C

CAS: 2731586-58-4
Formula: C₁₅H₁₃ClN₂O₂
MW: 288.73 g/mol

VQ-023229

Reference Standard

Neratinib Acetyl Impurity chemical structure

Neratinib Acetyl Impurity

CAS: 915941-95-6
Formula: C₂₆H₂₂ClN₅O₃
MW: 487.9 g/mol

In stock

Reference Standard

Neratinib Impurity 14 chemical structure

Neratinib Impurity 14

CAS: 1144516-15-3
Formula: C₂₈H₂₄ClN₅O₄
MW: 530 g/mol

In stock

Reference Standard

Neratinib Impurity 2 chemical structure

Neratinib Impurity 2

CAS: 848139-78-6
Formula: C₂₄H₂₀ClN₅O₂
MW: 445.9 g/mol

VQ-005349

Reference Standard

Neratinib Impurity 4 chemical structure

Neratinib Impurity 4

CAS: 1144516-19-7
Formula: C₂₈H₂₅ClN₆O₄
MW: 545 g/mol

In stock

Reference Standard

Neratinib Impurity Stage-01

Neratinib Impurity Stage-01

Formula: C₂₈H₂₄ClN₅O₅
MW: 545.97 g/mol

In stock

Reference Standard

Neratinib Impurity Stage-02

Neratinib Impurity Stage-02

CAS: 2517535-77-0
Formula: C₂₈H₂₂ClN₅O₄
MW: 527.96 g/mol

In stock

Reference Standard

Netarsudil Amino Acid Impurity chemical structure

Netarsudil Amino Acid Impurity

CAS: 2684301-49-1
Formula: C₁₉H₂₁NO₄
MW: 327.4 g/mol

VQ-026874

Reference Standard

Netupitant Carbamate Impurity chemical structure

Netupitant Carbamate Impurity

CAS: 342417-02-1
Formula: C₁₉H₂₄N₄O₂
MW: 340.4 g/mol

VQ-026879

Reference Standard

Netupitant Impurity 24 chemical structure

Netupitant Impurity 24

CAS: 342417-01-0
Formula: C₁₈H₂₂N₄O
MW: 310.4 g/mol

VQ-049219

Reference Standard

Neurosporaxanthin chemical structure

Neurosporaxanthin

CAS: 2468-88-4
Formula: C₃₅H₄₆O₂
MW: 498.7 g/mol

VQ-045229

Reference Standard

Nevirapine-12-(n-proylidenyl) chemical structure

Nevirapine-12-(n-proylidenyl)

CAS: 284686-27-7
Formula: C₁₈H₁₈N₄O
MW: 306.4 g/mol

VQ-032108

Reference Standard

Nicardipine Bis Analog chemical structure

Nicardipine Bis Analog

CAS: 71791-90-7
Formula: C₃₅H₄₀N₄O₆
MW: 612.7 g/mol

VQ-032115

Reference Standard

Nicardipine Dehydro Carboxylic Acid Impurity chemical structure

Nicardipine Dehydro Carboxylic Acid Impurity

CAS: 64603-72-1
Formula: C₁₆H₁₄N₂O₆
MW: 330.29 g/mol

In stock

Reference Standard

Nicardipine Diacetyl Derivative chemical structure

Nicardipine Diacetyl Derivative

CAS: 2469555-30-2
Formula: C₁₅H₁₇NO₆
MW: 307.3 g/mol

VQ-038600

Reference Standard

Nicardipine Dimethyl Ester chemical structure

Nicardipine Dimethyl Ester

CAS: 206976-29-6
Formula: C₁₇H₁₈N₂O₅
MW: 330.33 g/mol

VQ-032119

Reference Standard

Nicardipine Impurity A

Nicardipine Impurity A

CAS: 87625-92-1
Formula: C₁₅H₁₅NO₅
MW: 289.28 g/mol

VQ-032116

Reference Standard

Nicorandil 6-Hydroxy Impurity chemical structure

Nicorandil 6-Hydroxy Impurity

CAS: 113743-17-2
Formula: C₈H₉N₃O₅
MW: 227.17 g/mol

VQ-045422

Reference Standard

Nicorandil Dimer (Bromide) chemical structure

Nicorandil Dimer (Bromide)

CAS: 2250142-73-3
Formula: C₁₆H₁₈BrN₅O₅
MW: 440.25 g/mol

VQ-032124

Reference Standard

Nicorandil Dimer Iodide chemical structure

Nicorandil Dimer Iodide

CAS: 2250142-71-1
Formula: C₁₆H₁₈IN₅O₅
MW: 487.25 g/mol

VQ-026893

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