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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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Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity F

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CAS No.

: 89-65-6

Mol F.

: C6H8O6

Mol W.

: 176.12

Cat No.

: SA21500

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity G

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CAS No.

: 66757-69-5

Mol F.

: C6H6O7

Mol W.

: 190.11

Cat No.

: SA21507

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity H

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CAS No.

: 122046-79-1

Mol F.

: C7H8O7

Mol W.

: 204.13

Cat No.

: SA21501

Aspirin, Impurities

Aspirin; Acetylsalicylic Acid

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CAS No.

: 50-78-2

Mol F.

: C9H8O4

Mol W.

: 180.16

Cat No.

: SA28505

Ataluren, Impurities

Ataluren

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CAS No.

: 775304-57-9

Mol F.

: C15H9FN2O3

Mol W.

: 284.2

Cat No.

: SA55600

Ataluren, Impurities

Ataluren 2-Hydroxyphenyl Impurity

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CAS No.

: NA

Mol F.

: C15H10N2O4

Mol W.

: 282.3

Cat No.

: SA55604

Ataluren, Impurities

Ataluren 2-Methoxyphenyl Impurity

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CAS No.

: 775304-03-5

Mol F.

: C16H12N2O4

Mol W.

: 296.3

Cat No.

: SA55601

Ataluren, Impurities

Ataluren 3-Fluorophenyl Impurity

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CAS No.

: 775304-56-8

Mol F.

: C15H9FN2O3

Mol W.

: 284.2

Cat No.

: SA55606

Ataluren, Impurities

Ataluren 5-Chloro Impurity

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CAS No.

: NA

Mol F.

: C15H8ClFN2O3

Mol W.

: 318.7

Cat No.

: SA55605

Ataluren, Impurities

Ataluren Dibenzoic acid Impurity

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CAS No.

: NA

Mol F.

: C16H10N2O5

Mol W.

: 310.3

Cat No.

: SA55607

Ataluren, Impurities

Ataluren Methyl Ester

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CAS No.

: 775304-60-4

Mol F.

: C16H11FN2O3

Mol W.

: 298.3

Cat No.

: SA55603

Ataluren, Impurities

Ataluren Trichlorobenzene Impurity

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CAS No.

: 27020-96-8

Mol F.

: C8H4Cl3N

Mol W.

: 220.5

Cat No.

: SA55602

Atenolol, Impurities

Atenolol

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CAS No.

: 29122-68-7

Mol F.

: C14H22N2O3

Mol W.

: 266.34

Cat No.

: SA33600

Atenolol, Impurities

Atenolol EP Impurity A

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CAS No.

: 17194-82-0

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA33601

Atenolol, Impurities

Atenolol Ep Impurity B

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CAS No.

: 61698-76-8

Mol F.

: C11H15NO4

Mol W.

: 225.24

Cat No.

: SA33602

Atenolol, Impurities

Atenolol EP Impurity C

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CAS No.

: 29122-69-8

Mol F.

: C11H13NO3

Mol W.

: 207.23

Cat No.

: SA33603

Atenolol, Impurities

Atenolol EP Impurity D

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CAS No.

: 115538-83-5

Mol F.

: C11H14ClNO3

Mol W.

: 243.69

Cat No.

: SA33604

Atenolol, Impurities

Atenolol EP Impurity E

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CAS No.

: 141650-31-9

Mol F.

: C19H22N2O5

Mol W.

: 358.39

Cat No.

: SA33605

Atenolol, Impurities

Atenolol EP Impurity F

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CAS No.

: 87619-83-8

Mol F.

: C25H35N3O6

Mol W.

: 473.56

Cat No.

: SA33606

Atenolol, Impurities

Atenolol EP Impurity G

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CAS No.

: 56392-14-4

Mol F.

: C14H21NO4

Mol W.

: 267.32

Cat No.

: SA33607

Atenolol, Impurities

Atenolol EP Impurity H

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CAS No.

: 29277-73-4

Mol F.

: C14H20N2O2

Mol W.

: 248.32

Cat No.

: SA33608

Atenolol, Impurities

Atenolol EP Impurity I

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CAS No.

: 1797116-92-7

Mol F.

: C13H20N2O3

Mol W.

: 252.31

Cat No.

: SA33609

Atenolol, Impurities

Atenolol EP Impurity J

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CAS No.

: 81346-71-6

Mol F.

: C11H16N2O3

Mol W.

: 224.3

Cat No.

: SA33610

Atomoxetine, Impurities

Atomoxetine 3-Fluoro Impurity Racemate

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CAS No.

: NA

Mol F.

: C17H21ClFNO

Mol W.

: 309.81

Cat No.

: SA22109

Atomoxetine, Impurities

Atomoxetine 4-Hydroxy Impurity

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CAS No.

: 435293-66-6

Mol F.

: C17H21NO2

Mol W.

: 271.35

Cat No.

: SA22110

Atomoxetine, Impurities

Atomoxetine Chloro Impurity

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CAS No.

: 114446-47-8

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22111

Atomoxetine, Impurities

Atomoxetine EP Impurity A

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CAS No.

: 873310-33-9(HCl);56161-70-7(base)

Mol F.

: C16H20ClNO

Mol W.

: 277.79

Cat No.

: SA22101

Atomoxetine, Impurities

Atomoxetine EP Impurity B

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CAS No.

: 82857-39-4

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22102

Atomoxetine, Impurities

Atomoxetine EP Impurity C

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CAS No.

: 1643684-06-3

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22103

Atomoxetine, Impurities

Atomoxetine EP Impurity D

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CAS No.

: 873310-28-2

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22104

Atomoxetine, Impurities

Atomoxetine EP Impurity E

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CAS No.

: 17199-29-0

Mol F.

: C8H8O3

Mol W.

: 152.15

Cat No.

: SA22105

Atomoxetine, Impurities

Atomoxetine EP Impurity F

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CAS No.

: 1010818-92-4

Mol F.

: C17H21ClFNO

Mol W.

: 309.81

Cat No.

: SA22106

Atomoxetine, Impurities

Atomoxetine EP Impurity G

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CAS No.

: 2706536-33-4

Mol F.

: C27H34N2O2

Mol W.

: 418.57

Cat No.

: SA22107

Atomoxetine

Atomoxetine EP Impurity H

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CAS No.

: 42142-52-9

Mol F.

: C10H15NO

Mol W.

: 165.23

Cat No.

: SA22108

Atomoxetine, Impurities

Atomoxetine HCl

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CAS No.

: 82248-59-7

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22112

Atomoxetine, Impurities

Atomoxetine HCl Racemate

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CAS No.

: 82857-40-7

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22113

Atomoxetine, Impurities

Atomoxetine m-Methyl Racemate

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CAS No.

: 873310-29-3 (FreeBase)

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22114

Atomoxetine, Impurities

Atomoxetine N-Desmethyl Impurity

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CAS No.

: 881995-46-6

Mol F.

: C16H20ClNO

Mol W.

: 277.79

Cat No.

: SA22115

Atomoxetine, Impurities

Atomoxetine USP Related Compound C

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CAS No.

: 56161-78-5

Mol F.

: C17H21NO

Mol W.

: 255.4

Cat No.

: SA22124

Atorvastatin, Impurities

Atorvastatin (3S,5R)-Isomer Methyl Ester

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CAS No.

: 1429437-85-3

Mol F.

: C34H37FN2O5

Mol W.

: 572.67

Cat No.

: SA17819

Atorvastatin, Impurities

Atorvastatin 2-Hydroxy

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CAS No.

: 214217-86-4 (acid); 265989-46-6 (Salt)

Mol F.

: C33H35FN2O6

Mol W.

: 574.64

Cat No.

: SA17821

Atorvastatin, Impurities

Atorvastatin 3-Oxo Acid

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CAS No.

: 1391052-00-8 (Salt)

Mol F.

: C33H33FN2O5

Mol W.

: 556.62

Cat No.

: SA17822

Atorvastatin, Impurities

Atorvastatin 3-Oxopropyl Impurity

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CAS No.

: 110862-46-9

Mol F.

: C29H27FN2O2

Mol W.

: 454.54

Cat No.

: SA17823

Atorvastatin

Atorvastatin Diamino Impurity

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CAS No.

: 1116118-82-1

Mol F.

: C50H64FN3O8

Mol W.

: 854.06

Cat No.

: SA17849

Atorvastatin, Impurities

Atorvastatin EP Impurity B

$450.00 25 mg

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CAS No.

: 842103-12-2

Mol F.

: C33H35N2O5

Mol W.

: 558.64

Cat No.

: SA17810

Atorvastatin, Impurities

Atorvastatin EP Impurity D

$450.00 25 mg

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CAS No.

: 148146-51-4

Mol F.

: C26H22FNO4

Mol W.

: 431.46

Cat No.

: SA17812

Atorvastatin, Impurities

Atorvastatin EP Impurity Q

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CAS No.

: 906552-18-9

Mol F.

: C33H35FN2O6

Mol W.

: 574.6

Cat No.

: SA17850

Atorvastatin, Impurities

Atorvastatin Epoxy Pyrrolooxazin 6-Hydroxy Analog

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CAS No.

: 873950-17-5

Mol F.

: C33H35FN2O7

Mol W.

: 590.64

Cat No.

: SA17851

Atorvastatin, Impurities

Atorvastatin Epoxy Pyrrolooxazin 7-Hydroxy Analog

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CAS No.

: 873950-18-6

Mol F.

: C33H35FN2O7

Mol W.

: 590.64

Cat No.

: SA17852

Atovaquone, Impurities

Atovaquone

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CAS No.

: 95233-18-4

Mol F.

: C22H19ClO3

Mol W.

: 366.8

Cat No.

: SA55000