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

R-Modafinil Acid chemical structure

R-Modafinil Acid

CAS: 112111-45-2
Formula: C₁₅H₁₄O₃S
MW: 274.3 g/mol

VQ-028838

Reference Standard

R-Pralatrexate chemical structure

CAS: 1320211-70-8
Formula: C₂₃H₂₃N₇O₅
MW: 477.5 g/mol

VQ-033262

Reference Standard

R-Pregabalin Amide Lactose Adduct chemical structure

R-Pregabalin Amide Lactose Adduct

CAS: 501665-88-9
Formula: C₂₀H₃₅NO₁₁
MW: 465.5 g/mol

VQ-041627

Reference Standard

R-Safinamide methanesulfonate

R-Safinamide methanesulfonate

CAS: 248582-83-4
Formula: C₁₈H₂₃FN₂O₅S
MW: 398.45 g/mol

VQ-042073

Reference Standard

R-Thiotic Acid Tromethamine chemical structure

R-Thiotic Acid Tromethamine

CAS: 137314-40-0
Formula: C₁₂H₂₅NO₅S₂
MW: 327.5 g/mol

VQ-034198

Reference Standard

R(+)Amlodipine Besylate chemical structure

R(+)Amlodipine Besylate

CAS: 828247-64-9
Formula: C₂₆H₃₁ClN₂O₈S
MW: 567.1 g/mol

VQ-020792

Reference Standard

Rabeprazole 0.276 RRT Impurity

Rabeprazole 0.276 RRT Impurity

Formula: C₁₈H₁₈N₃O₃⁺
MW: 324.35 g/mol

In stock

Reference Standard

Rabeprazole 2-Chloromethyl Impurity chemical structure

Rabeprazole 2-Chloromethyl Impurity

CAS: 153259-31-5
Formula: C₁₁H₁₇Cl₂NO₂
MW: 266.16 g/mol

In stock

Reference Standard

Rabeprazole 2-Chloromethyl Impurity(Freebase) chemical structure

Rabeprazole 2-Chloromethyl Impurity(Freebase)

CAS: 117977-20-5
Formula: C₁₁H₁₆ClNO₂
MW: 229.7 g/mol

VQ-005684

Reference Standard

Rabeprazole 4-Methoxy Impurity chemical structure

Rabeprazole 4-Methoxy Impurity

CAS: 102804-77-3
Formula: C₁₅H₁₅N₃O₂S
MW: 301.4 g/mol

In stock

Reference Standard

Rabeprazole Carboxylic Acid Impurity chemical structure

Rabeprazole Carboxylic Acid Impurity

CAS: 1163685-31-1
Formula: C₁₁H₁₅NO₄
MW: 225.24 g/mol

VQ-027713

Reference Standard

Rabeprazole Impurity 1 (N-2) Stage chemical structure

Rabeprazole Impurity 1 (N-2) Stage

CAS: 54874-26-9
Formula: C₈H₁₀O₂
MW: 138.16 g/mol

In stock

Reference Standard

Rabeprazole Impurity 2 chemical structure

Rabeprazole Impurity 2

CAS: 1807988-36-8
Formula: C₁₈H₁₉N₃O₄
MW: 341.4 g/mol

VQ-005687

Reference Standard

Rabeprazole Impurity D Sulfide chemical structure

Rabeprazole Impurity D Sulfide

CAS: 103312-62-5
Formula: C₁₄H₁₂ClN₃S
MW: 289.8 g/mol

VQ-027712

Reference Standard

Rabeprazole Impurity G chemical structure

Rabeprazole Impurity G

CAS: 935260-92-7
Formula: C₂₉H₃₆N₄O₅S
MW: 552.7 g/mol

VQ-027710

Reference Standard

Rabeprazole Impurity H chemical structure

Rabeprazole Impurity H

CAS: 168167-42-8
Formula: C₁₄H₁₂ClN₃OS
MW: 305.8 g/mol

In stock

Reference Standard

Rabeprazole N-Alkyl Sulfide chemical structure

Rabeprazole N-Alkyl Sulfide

CAS: 1114543-47-3
Formula: C₂₉H₃₆N₄O₄S
MW: 536.7 g/mol

VQ-027716

Reference Standard

Rabeprazole Sulfone Impurity chemical structure

Rabeprazole Sulfone Impurity

CAS: 117976-47-3
Formula: C₁₈H₂₁N₃O₄S
MW: 375.4 g/mol

In stock

Reference Standard

Rabeprazole Sulfonic Acid Impurity chemical structure

Rabeprazole Sulfonic Acid Impurity

CAS: 40828-54-4
Formula: C₇H₆N₂O₃S
MW: 198.2 g/mol

In stock

Reference Standard

rac 1-Chloro-3-[4-(2-methoxyethyl)phenoxy]-2-propanol chemical structure

rac 1-Chloro-3-[4-(2-methoxyethyl)phenoxy]-2-propanol

CAS: 56718-76-4
Formula: C₁₂H₁₇ClO₃
MW: 244.71 g/mol

VQ-026667

Reference Standard

rac 3,4-Dihydroxymandelic Acid chemical structure

rac 3,4-Dihydroxymandelic Acid

CAS: 775-01-9
Formula: C₈H₈O₅
MW: 184.15 g/mol

VQ-037752

Reference Standard

rac 4-(2,3-Dichlorophenyl)-3,4-dihydro-1(2H)-naphthalenone chemical structure

rac 4-(2,3-Dichlorophenyl)-3,4-dihydro-1(2H)-naphthalenone

CAS: 152448-80-1
Formula: C₁₆H₁₂Cl₂O
MW: 291.2 g/mol

VQ-033822

Reference Standard

Rac 4,5-Dehydro Pregabalin chemical structure

Rac 4,5-Dehydro Pregabalin

CAS: 216576-74-8
Formula: C₈H₁₅NO₂
MW: 157.21 g/mol

VQ-027608

Reference Standard

rac 5,6-Dehydro Pregabalin chemical structure

rac 5,6-Dehydro Pregabalin

CAS: 1136478-30-2
Formula: C₈H₁₅NO₂
MW: 157.21 g/mol

VQ-027609

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