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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

17-alpha-Ethynyl Estradiol-3-Sulfate chemical structure

17-alpha-Ethynyl Estradiol-3-Sulfate

CAS: 24560-70-1
Formula: C₂₀H₂₄O₅S
MW: 376.5 g/mol

VQ-037124

Reference Standard

17-beta-Dihydro Equilin chemical structure

17-beta-Dihydro Equilin

CAS: 3563-27-7
Formula: C₁₈H₂₂O₂
MW: 270.4 g/mol

VQ-025629

Reference Standard

17-Deoxy cortienic acid chemical structure

17-Deoxy cortienic acid

CAS: 2394-25-4
Formula: C₂₀H₂₈O₄
MW: 332.4 g/mol

VQ-022807

Reference Standard

17-epi-Nandrolone chemical structure

17-epi-Nandrolone

CAS: 20708-81-0
Formula: C₁₈H₂₆O₂
MW: 274.4 g/mol

VQ-044253

Reference Standard

17-Hydroxyprogesterone Trifluoroacetate chemical structure

17-Hydroxyprogesterone Trifluoroacetate

CAS: 560-10-1
Formula: C₂₃H₂₉F₃O₄
MW: 426.5 g/mol

VQ-043268

Reference Standard

17-Iodoandrosta-5,16-dien-3beta-ol 3-Acetate chemical structure

17-Iodoandrosta-5,16-dien-3beta-ol 3-Acetate

CAS: 114611-53-9
Formula: C₂₁H₂₉IO₂
MW: 440.4 g/mol

VQ-024198

Reference Standard

17-Keto Flumethasone chemical structure

17-Keto Flumethasone

CAS: 25256-97-7
Formula: C₂₀H₂₄F₂O₃
MW: 350.4 g/mol

VQ-043174

Reference Standard

17-Keto Fulvestrant chemical structure

17-Keto Fulvestrant

CAS: 403656-89-3
Formula: C₃₂H₄₅F₅O₃S
MW: 604.8 g/mol

VQ-022725

Reference Standard

17-Methoxycarbonyl Loteprednol chemical structure

17-Methoxycarbonyl Loteprednol

CAS: 265651-89-6
Formula: C₂₃H₂₉ClO₇
MW: 452.9 g/mol

VQ-031655

Reference Standard

17-Methyl-18-norandrosta-5,13(17)-dien-3b-ol chemical structure

17-Methyl-18-norandrosta-5,13(17)-dien-3b-ol

CAS: 23930-65-6
Formula: C₁₉H₂₈O
MW: 272.4 g/mol

VQ-041657

Reference Standard

17-O-Acetyl-6-methylprednisolone chemical structure

17-O-Acetyl-6-methylprednisolone

CAS: 86401-94-7
Formula: C₂₄H₃₂O₆
MW: 416.5 g/mol

VQ-023548

Reference Standard

17-Oxo Betamethasone chemical structure

17-Oxo Betamethasone

CAS: 3109-01-1
Formula: C₂₀H₂₅FO₃
MW: 332.4 g/mol

VQ-034958

Reference Standard

17-β-Dihydro Equilenin 3-Sulfate Sodium Salt chemical structure

17-β-Dihydro Equilenin 3-Sulfate Sodium Salt

CAS: 16680-50-5
Formula: C₁₈H₁₉NaO₅S
MW: 370.4 g/mol

VQ-037103

Reference Standard

17-β-Methyl epi-Testosterone chemical structure

17-β-Methyl epi-Testosterone

CAS: 2607-14-9
Formula: C₂₀H₃₀O₂
MW: 302.5 g/mol

VQ-044719

Reference Standard

17,17-Dimethyl-18-nor-5β-androsta-1,13-dien-3a-ol chemical structure

17,17-Dimethyl-18-nor-5β-androsta-1,13-dien-3a-ol

CAS: 186099-81-0
Formula: C₂₀H₃₀O
MW: 286.5 g/mol

VQ-044544

Reference Standard

17a-Dihydro Equilenin chemical structure

17a-Dihydro Equilenin

CAS: 6639-99-2
Formula: C₁₈H₂₀O₂
MW: 268.3 g/mol

VQ-022571

Reference Standard

17beta Dihydro Equilenin chemical structure

17beta Dihydro Equilenin

CAS: 1423-97-8
Formula: C₁₈H₂₀O₂
MW: 268.3 g/mol

VQ-025570

Reference Standard

17beta-Carboxy-17-desoxy dexamethasone chemical structure

17beta-Carboxy-17-desoxy dexamethasone

CAS: 75262-69-0
Formula: C₂₁H₂₇FO₄
MW: 362.4 g/mol

VQ-022338

Reference Standard

17beta-Dihydro-17alpha-ethynyl-equillenin chemical structure

17beta-Dihydro-17alpha-ethynyl-equillenin

CAS: 1357266-17-1
Formula: C₂₀H₂₀O₂
MW: 292.4 g/mol

VQ-025643

Reference Standard

17beta-Dihydroequilin Sodium Sulfate chemical structure

17beta-Dihydroequilin Sodium Sulfate

CAS: 16680-49-2
Formula: C₁₈H₂₁NaO₅S
MW: 372.4 g/mol

VQ-037102

Reference Standard

17Beta-Estradiol Sodium Sulfate chemical structure

17Beta-Estradiol Sodium Sulfate

CAS: 4999-79-5
Formula: C₁₈H₂₃NaO₅S
MW: 374.4 g/mol

VQ-030592

Reference Standard

17S-Naltrexone Methobromide chemical structure

17S-Naltrexone Methobromide

CAS: 916045-21-1
Formula: C₂₁H₂₆BrNO₄
MW: 436.3 g/mol

VQ-026826

Reference Standard

17α-Dihydro Equilenin 3-Sulfate Sodium Salt chemical structure

17α-Dihydro Equilenin 3-Sulfate Sodium Salt

CAS: 56086-66-9
Formula: C₁₈H₁₉NaO₅S
MW: 370.4 g/mol

VQ-030577

Reference Standard

17α-Estradiol 17-Valerate chemical structure

17α-Estradiol 17-Valerate

CAS: 182624-54-0
Formula: C₂₃H₃₂O₃
MW: 356.5 g/mol

VQ-043163

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