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

Fulvestrant Impurity 22 chemical structure

Fulvestrant Impurity 22

CAS: 875573-60-7
Formula: C₃₅H₆₀O₄Si
MW: 572.9 g/mol

VQ-025936

Reference Standard

Fulvestrant Impurity 27 chemical structure

Fulvestrant Impurity 27

CAS: 875573-64-1
Formula: C₂₉H₄₆O₄
MW: 458.7 g/mol

VQ-048476

Reference Standard

Fulvestrant R enantiomer chemical structure

Fulvestrant R enantiomer

CAS: 1807900-80-6
Formula: C₃₂H₄₇F₅O₃S
MW: 606.8 g/mol

VQ-030905

Reference Standard

Fulvestrant S enantiomer chemical structure

Fulvestrant S enantiomer

CAS: 1316849-17-8
Formula: C₃₂H₄₇F₅O₃S
MW: 606.8 g/mol

VQ-030906

Reference Standard

Fulvestrant Side Chain Impurity chemical structure

Fulvestrant Side Chain Impurity

CAS: 148757-89-5
Formula: C₁₄H₂₄BrF₅S
MW: 399.3 g/mol

VQ-030907

Reference Standard

Fulvestrant-3-Sulfate

Fulvestrant-3-Sulfate

CAS: 261506-26-7
Formula: C₃₂H₄₇F₅O₆S₂
MW: 686.8 g/mol

VQ-030900

Reference Standard

Fungisterol chemical structure

CAS: 516-78-9
Formula: C₂₈H₄₈O
MW: 400.7 g/mol

VQ-027309

Reference Standard

Furazidin Sodium chemical structure

Furazidin Sodium

CAS: 22060-47-5
Formula: C₁₀H₇N₄NaO₅
MW: 286.18 g/mol

VQ-037458

Reference Standard

Furosemide Amide Impurity chemical structure

Furosemide Amide Impurity

CAS: 4793-47-9
Formula: C₁₂H₁₂ClN₃O₄S
MW: 329.76 g/mol

VQ-030910

Reference Standard

Furosemide Dimer Impurity chemical structure

Furosemide Dimer Impurity

CAS: 94419-32-6
Formula: C₁₄H₇Cl₄NO₈S₂
MW: 523.1 g/mol

VQ-025868

Reference Standard

Furyl-2-Carbonylthiol chemical structure

Furyl-2-Carbonylthiol

CAS: 4741-45-1
Formula: C₅H₄O₂S
MW: 128.15 g/mol

VQ-040453

Reference Standard

Fusidic Acid 3,11-Diketo Impurity chemical structure

Fusidic Acid 3,11-Diketo Impurity

CAS: 3482-38-0
Formula: C₃₁H₄₄O₆
MW: 512.7 g/mol

VQ-025942

Reference Standard

Gabapentin (GPT) Allyl impurity

Gabapentin (GPT) Allyl impurity

Formula: C₁₆H₂₇NO₃
MW: 281.39 g/mol

In stock

Reference Standard

Gabapentin (Stage-I) chemical structure

Gabapentin (Stage-I)

CAS: 60142-94-1
Formula: C₁₁H₁₈O₄
MW: 214.26 g/mol

In stock

Reference Standard

Gabapentin Acid Impurity chemical structure

Gabapentin Acid Impurity

CAS: 1281568-83-9
Formula: C₁₃H₂₃NO₃
MW: 241.33 g/mol

In stock

Reference Standard

Gabapentin Cyclic Impurity chemical structure

Gabapentin Cyclic Impurity

CAS: 3048030-55-0
Formula: C₁₆H₂₅NO₅
MW: 311.37 g/mol

In stock

Reference Standard

Gabapentin Di-Nitrile Impurity chemical structure

Gabapentin Di-Nitrile Impurity

CAS: 4172-99-0
Formula: C₉H₁₂N₂
MW: 148.2 g/mol

VQ-025945

Reference Standard

Gabapentin Dimer chemical structure

Gabapentin Dimer

CAS: 1083246-63-2
Formula: C₁₈H₃₂N₂O₃
MW: 324.5 g/mol

VQ-030919

Reference Standard

Gabapentin Ethyl Ester Hydrochloride chemical structure

Gabapentin Ethyl Ester Hydrochloride

CAS: 60175-04-4
Formula: C₁₁H₂₂ClNO₂
MW: 235.75 g/mol

VQ-030921

Reference Standard

Gabapentin Impurity 49 (Freebase) chemical structure

Gabapentin Impurity 49 (Freebase)

CAS: 768358-87-8
Formula: C₁₆H₂₃NO₂
MW: 261.36 g/mol

VQ-005019

Reference Standard

Gabapentin Impurity 49 (Hydrochloride) chemical structure

Gabapentin Impurity 49 (Hydrochloride)

CAS: 649747-95-5
Formula: C₁₆H₂₄ClNO₂
MW: 297.82 g/mol

In stock

Reference Standard

Gabapentin Impurity 50 chemical structure

Gabapentin Impurity 50

CAS: 649747-98-8
Formula: C₂₃H₃₃NO₆
MW: 419.5 g/mol

In stock

Reference Standard

Gabapentin Impurity 51 chemical structure

Gabapentin Impurity 51

CAS: 1310678-10-4
Formula: C₁₉H₃₂N₂O₅
MW: 368.5 g/mol

In stock

Reference Standard

Gabapentin Lactom Impurity chemical structure

Gabapentin Lactom Impurity

CAS: 1344032-05-8
Formula: C₁₉H₃₀N₂O₄
MW: 350.5 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