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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Aripiprazole, Impurities

Aripiprazole EP Impurity G

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In Stock

CAS No.

: 1797986-18-5

Mol F.

: C48H56Cl4N6O4

Mol W.

: 922.81

Cat No.

: SA24004

Aripiprazole, Impurities

Aripiprazole Hydroxybutylpiperazine Impurity

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In Stock

CAS No.

: 870765-38-1

Mol F.

: C14H21Cl3N2O

Mol W.

: 303.23

Cat No.

: SA24017

Aripiprazole, Impurities

Aripiprazole Impurity 2

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In Stock

CAS No.

: 1424857-93-1

Mol F.

: C14H18Cl2N2

Mol W.

: 285.21

Cat No.

: SA24006

Aripiprazole, Impurities

Aripiprazole Impurity 3

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In Stock

CAS No.

: 1359829-23-4

Mol F.

: C13H15NO2

Mol W.

: 217.26

Cat No.

: SA24007

Aripiprazole, Impurities

Aripiprazole Impurity B

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In Stock

CAS No.

: 1424858-02-5

Mol F.

: C26H32N2O5

Mol W.

: 452.54

Cat No.

: SA24029

Aripiprazole, Impurities

Aripiprazole Iodo butoxyquinoline

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In Stock

CAS No.

: 952308-47-3

Mol F.

: C13H16INO2

Mol W.

: 345.18

Cat No.

: SA24026

Aripiprazole, Impurities

Aripiprazole N-Bromobutyl Impurity

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In Stock

CAS No.

: 1424857-68-0

Mol F.

: C13H16BrNO2

Mol W.

: 298.18

Cat No.

: SA24019

Aripiprazole, Impurities

Aripiprazole N-Isomer

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In Stock

CAS No.

: 1797983-65-3

Mol F.

: C23H27Cl2N3O2

Mol W.

: 448.39

Cat No.

: SA24021

Impurities, Rilpivirine

Aryl amide Impurity

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In Stock

CAS No.

: 1446439-51-5

Mol F.

: C22H20N6O

Mol W.

: 384.43

Cat No.

: SA25407

Atorvastatin, Impurities

ATN-1 triamino impurity

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C60H81FN4O11

Mol W.

: 1053.3

Cat No.

: SA17846

Atomoxetine, Impurities

Atomoxetine-N-Amide Impurity

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In Stock

CAS No.

: NA

Mol F.

: C18H22N2O2

Mol W.

: 298.38

Cat No.

: SA22100

Atorvastatin, Impurities

Atorvastain racemic cyano side chain

$300.00 100 mg

In Stock

CAS No.

Mol F.

: C14H23NO4

Mol W.

: 269.34

Cat No.

: SA17805

Atorvastatin, Impurities

Atorvastatin 2,3-Anhydro Lactone

$200.00 25 mg

In Stock

CAS No.

: 442851-50-5

Mol F.

: C33H31FN2O3

Mol W.

: 522.61

Cat No.

: SA17820

Atorvastatin, Impurities

Atorvastatin 5-Oxo Acid

$255.00 25 mg

In Stock

CAS No.

: 1391052-82-6

Mol F.

: C33H33FN2O5

Mol W.

: 556.62

Cat No.

: SA17806

Atorvastatin, Impurities

Atorvastatin Acetonide t-Butyl Ester Side Chain (4S,6R)-Isomer

$220.00 50 mg

In Stock

CAS No.

: 186508-95-2

Mol F.

: C14H23NO4

Mol W.

: 269.34

Cat No.

: SA17830

Atorvastatin, Impurities

Atorvastatin Acetonide t-Butyl Ester Side Chain (4S,6S)-Isomer

$350.00 100 mg

In Stock

CAS No.

: 196085-85-5

Mol F.

: C14H23NO4

Mol W.

: 269.34

Cat No.

: SA17831

Atorvastatin, Impurities

Atorvastatin Diamino side chain impurity

$195.00 25 mg

In Stock

CAS No.

: 2299304-89-3

Mol F.

: C24H44N2O7

Mol W.

: 472.62

Cat No.

: SA17847

Atorvastatin, Impurities

Atorvastatin Dibromo

$250.00 50 mg

In Stock

CAS No.

: 2514955-94-1

Mol F.

: C14H9Br2FO

Mol W.

: 372.03

Cat No.

: SA17837

Atorvastatin, Impurities

Atorvastatin Difluoro Impurity

$150.00 25 mg

In Stock

CAS No.

: 693793-82-7

Mol F.

: C26H23F2NO3

Mol W.

: 435.46

Cat No.

: SA17845

Atorvastatin, Impurities

Atorvastatin Diketo Amide Desfluoro Impurity

$150.00 25 mg

In Stock

CAS No.

: 444577-70-2

Mol F.

: C26H25NO3

Mol W.

: 399.48

Cat No.

: SA17834

Atorvastatin, Impurities

Atorvastatin EP Impurity A

$60.00 10 mg

In Stock

CAS No.

: 433289-84-0 (acid); 433289-83-9 (sodium salt)

Mol F.

: C33H36N2O5

Mol W.

: 540.65

Cat No.

: SA17809

Atorvastatin, Impurities

Atorvastatin EP Impurity C

$150.00 25 mg

In Stock

CAS No.

: 693793-53-2; 693794-20-6

Mol F.

: C33H34F2N2O5

Mol W.

: 576.63

Cat No.

: SA17811

Atorvastatin, Impurities

Atorvastatin EP Impurity E

$80.00 10 mg

In Stock

CAS No.

: 501121-34-2,1105067-88-6(CaSalt)

Mol F.

: C33H35FN2O5

Mol W.

: 558.64

Cat No.

: SA17813

Atorvastatin, Impurities

Atorvastatin EP Impurity F

$200.00 25 mg

In Stock

CAS No.

: 887196-24-9(acid);1105067-87-5(calciumsalt)

Mol F.

: CF40H48FN3O8

Mol W.

: 717.82

Cat No.

: SA17814

Atorvastatin, Impurities

Atorvastatin EP Impurity G

$150.00 10 mg

In Stock

CAS No.

: 88719-29-4(Salt); 887324-53-0 (Free base)

Mol F.

: C34H37FN2O5

Mol W.

: 572.66

Cat No.

: SA17815

Atorvastatin, Impurities

Atorvastatin EP Impurity H

$100.00 25 mg

In Stock

CAS No.

: 125995-03-1

Mol F.

: C33H33FN2O4

Mol W.

: 540.62

Cat No.

: SA17816

Atorvastatin, Impurities

Atorvastatin EP Impurity I

$100.00 100 mg

In Stock

CAS No.

: 125971-95-1

Mol F.

: C40H47FN2O5

Mol W.

: 654.81

Cat No.

: SA17817

Atorvastatin, Impurities

Atorvastatin EP Impurity P

$150.00 50 mg

In Stock

CAS No.

: 581772-29-4

Mol F.

: C36H39FN2O5

Mol W.

: 598.7

Cat No.

: SA17836

Atorvastatin, Impurities

Atorvastatin ethyl ester impurity

$155.00 50 mg

In Stock

CAS No.

: 1146977-93-6

Mol F.

: C₃₅H₃₉FN₂O₅

Mol W.

: 586.69

Cat No.

: SA17824

Atorvastatin, Impurities

Atorvastatin Methyl Ester

$155.00 50 mg

In Stock

CAS No.

: 345891-62-5

Mol F.

: C34H37FN2O5

Mol W.

: 572.7

Cat No.

: SA17826

Atorvastatin, Impurities

Atorvastatin tert-Butyl Ester

$150.00 25 mg

In Stock

CAS No.

: 134395-00-9

Mol F.

: C37H43FN2O5

Mol W.

: 614.74

Cat No.

: SA17825

Atorvastatin, Impurities

Atorvastatin Triamino impurity

$195.00 10 mg

In Stock

CAS No.

Mol F.

: C34H61N3O10

Mol W.

: 671.86

Cat No.

: SA17848

Atropine, Impurities

Atropine EP Impurity A

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In Stock

CAS No.

: 500-55-0 (Base); 5978-81-4 (HCl)

Mol F.

: C17H21NO2

Mol W.

: 271.36

Cat No.

: SA47701

Atropine, Impurities

Atropine EP Impurity B

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In Stock

CAS No.

: 16839-98-8; 75559-01-2 (HCl)

Mol F.

: C16H21NO3

Mol W.

: 275.34

Cat No.

: SA47702

Azathioprine, Impurities

Azathioprine EP Impurity B

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In Stock

CAS No.

: 157930-13-7

Mol F.

: C5H4N4S

Mol W.

: 152.18

Cat No.

: SA17903

Azathioprine, Impurities

Azathioprine EP Impurity G

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In Stock

CAS No.

: 5581-52-2

Mol F.

: C9H8N8O2S

Mol W.

: 292.28

Cat No.

: SA17908

Azilsartan, Impurities

Azilsartan

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In Stock

CAS No.

: 147403-03-0

Mol F.

: C25H20N4O5

Mol W.

: 456.45

Cat No.

: SA42800

Azilsartan, Impurities

Azilsartan Amide Medoxomil

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In Stock

CAS No.

: 1696392-12-7

Mol F.

: C29H25N3O7

Mol W.

: 527.52

Cat No.

: SA42810

Azilsartan, Impurities

Azilsartan Ethyl Ester

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In Stock

CAS No.

: 1403474-70-3

Mol F.

: C27H24N4O5

Mol W.

: 484.5

Cat No.

: SA42812

Azilsartan, Impurities

Azilsartan Methyl Ester

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In Stock

CAS No.

: 147403-52-9

Mol F.

: C26H22N4O5

Mol W.

: 470.48

Cat No.

: SA42802

Azilsartan, Impurities

Azilsartan O-Desethyl Nitrile Impurity

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In Stock

CAS No.

: 139481-33-7

Mol F.

: C23H17N3O3

Mol W.

: 383.4

Cat No.

: SA42805

Azithromycin, Impurities

Azithromycin EP Impurity G

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In Stock

CAS No.

: 612069-31-5

Mol F.

: C₄₄H₇₆N₂O₁₄S

Mol W.

: 889.14

Cat No.

: SA10313

Azithromycin, Impurities

Azithromycin EP Impurity H

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In Stock

CAS No.

: 612069-30-4

Mol F.

: C45H77N3O15S

Mol W.

: 932.17

Cat No.

: SA10314

Azithromycin, Impurities

Azithromycin Impurity I

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In Stock

CAS No.

: 172617-84-4

Mol F.

: C37H70N2O12

Mol W.

: 734.96

Cat No.

: SA10303

Azithromycin, Impurities

Azithromycin Impurity J

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In Stock

CAS No.

: 117693-41-1

Mol F.

: C30H58N2O9

Mol W.

: 590.79

Cat No.

: SA10304

Beclomethasone Dipropionate, Impurities

Beclomethasone

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In Stock

CAS No.

Mol F.

: C22H29ClO5

Mol W.

: 408.93

Cat No.

: SA15604

Beclomethasone Dipropionate, Impurities

Beclomethasone 11,17,21-Tripropionate

$355.00 25 mg

In Stock

CAS No.

: 1709825-83-1

Mol F.

: C31H41ClO8

Mol W.

: 577.11

Cat No.

: SA15619

Beclomethasone Dipropionate, Impurities

Beclomethasone 17-Propionate

$155.00 25 mg

In Stock

CAS No.

: 5534-18-9

Mol F.

: C25H33ClO6

Mol W.

: 464.98

Cat No.

: SA15603

Beclomethasone Dipropionate, Impurities

Beclomethasone 21-Acetate 17-Propionate

$195.00 25 mg

In Stock

CAS No.

: 5534-13-4

Mol F.

: C27H35ClO7

Mol W.

: 507.02

Cat No.

: SA15610

Beclomethasone Dipropionate, Impurities

Beclomethasone 21-Butyrate 17-Propionate

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C29H39ClO7

Mol W.

: 535.07

Cat No.

: SA15611