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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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Apremilast, Impurities

Apremilast Diethoxy Analog

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CAS No.

Mol F.

: C23H26N2O7S

Mol W.

: 474.53

Cat No.

: SA30024

Apremilast, Impurities

Apremilast dimethoxy analog | CAS: 1809089-51-7

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CAS No.

: 1809089-51-7

Mol F.

: C21H22N2O7S

Mol W.

: 446.48

Cat No.

: SA30022

Apremilast, Impurities

Apremilast Enamine Impurity

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CAS No.

: 1715011-38-3

Mol F.

: C12H17NO4S

Mol W.

: 271.3

Cat No.

: SA30029

Apremilast, Impurities

Apremilast EP Impurity C

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CAS No.

: 2487573-02-2

Mol F.

: C21H21NO7S

Mol W.

: 431.46

Cat No.

: SA30002

Apremilast, Impurities

Apremilast EP Impurity D

$795.00 25 mg

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CAS No.

: 2448678-64-4

Mol F.

: C23H26N2O7S

Mol W.

: 474.53

Cat No.

: SA30003

Apremilast, Impurities

Apremilast EP Impurity E

$795.00 25 mg

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CAS No.

: 2487573-03-3

Mol F.

: C22H24N2O7S

Mol W.

: 460.5

Cat No.

: SA30004

Apremilast, Impurities

Apremilast EP Impurity F

$595.00 25 mg

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CAS No.

Mol F.

: C20H24N2O7S

Mol W.

: 436.48

Cat No.

: SA30005

Apremilast, Impurities

Apremilast Ethanamine L(-)pyroglutamate Salt (S Isomer)

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CAS No.

: 1912443-44-7

Mol F.

: C17H26N2O7S

Mol W.

: 402.46

Cat No.

: SA30027

Apremilast, Impurities

Apremilast Ethyl Vanillin Impurity

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CAS No.

: 121-32-4

Mol F.

: C9H10O3

Mol W.

: 166.2

Cat No.

: SA30025

Apremilast, Impurities

Apremilast N-Desacetyl O4-Desmethyl O3-Desethyl Impurity

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CAS No.

: 1384439-80-8

Mol F.

: C17H16N2O6S

Mol W.

: 376.38

Cat No.

: SA30011

Apremilast, Impurities

Apremilast Phthalic Anhydride Impurity

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CAS No.

: 6296-53-3

Mol F.

: C10H7NO4

Mol W.

: 205.2

Cat No.

: SA30028

Apremilast

Apremilast R-Isomer

$225.00 25 mg

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CAS No.

: 608141-44-2

Mol F.

: C22H24N2O7S

Mol W.

: 460.5

Cat No.

: SA30007

Aprepitant, Impurities

Aprepitant (R,S,S)-Isomer

$1,250.00 25 mg

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CAS No.

: 172822-28-5

Mol F.

: C23H21F7N4O3

Mol W.

: 534.4

Cat No.

: SA43709

Aprepitant, Impurities

Aprepitant EP Impurity B

$555.00 25 mg

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CAS No.

: 2348441-62-1

Mol F.

: C29H25F7N4O3

Mol W.

: 610.5

Cat No.

: SA43710

Aprepitant, Impurities

Aprepitant EP Impurity C

$555.00 25 mg

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CAS No.

: 2348441-63-2

Mol F.

: C29H25F7N4O3

Mol W.

: 610.5

Cat No.

: SA43711

Fosaprepitant, Impurities

Aprepitant M2 Metabolite (1S, 2S, 3R)-Isomer

$450.00 25 mg

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CAS No.

: 327623-37-0 (free base); 2475188-05-5

Mol F.

: C20H18F7NO2

Mol W.

: 437.35

Cat No.

: SA45422

Aprepitant, Impurities, Nitrosamine

Aprepitant N-Nitroso N-Benzyl Hydroxyl Amine Impurity

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CAS No.

: 77817-40-4

Mol F.

: C9H12N2O2

Mol W.

: 180.2

Cat No.

: SA43712

Formoterol, Impurities

Arformoterol

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CAS No.

: 67346-49-0

Mol F.

: C19H24N2O4

Mol W.

: 344.40

Cat No.

: SA21116

Argatroban, Impurities

Argatroban

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CAS No.

: 74863-84-6

Mol F.

: C23H36N6O5S

Mol W.

: 508.6

Cat No.

: SA48400

Argatroban, Impurities

Argatroban (21R)-Isomer

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CAS No.

: 121785-71-5

Mol F.

: C23H36N6O5S

Mol W.

: 508.63

Cat No.

: SA48404

Argatroban, Impurities

Argatroban (21S)-Isomer

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CAS No.

: 121785-72-6

Mol F.

: C23H36N6O5S

Mol W.

: 508.63

Cat No.

: SA48403

Argatroban, Impurities

Argatroban (2S,4R)-Isomer

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CAS No.

: 189264-02-6

Mol F.

: C23H36N6O5S

Mol W.

: 508.63

Cat No.

: SA48402

Argatroban, Impurities

Argatroban (2S,4S)-Isomer

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CAS No.

: 189264-03-7

Mol F.

: C23H36N6O5S

Mol W.

: 508.63

Cat No.

: SA48401

Argatroban, Impurities

Argatroban 5-Amino Impurity

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CAS No.

: 188659-43-0

Mol F.

: C22H34N4O5S

Mol W.

: 466.59

Cat No.

: SA48409

Argatroban, Impurities

Argatroban USP Related Compound A

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CAS No.

: 74874-10-5

Mol F.

: C23H31N7O7S

Mol W.

: 549.6

Cat No.

: SA48405

Aripiprazole, Impurities

Aripiprazole

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CAS No.

: 129722-12-9

Mol F.

: C23H27Cl2N3O2

Mol W.

: 448.4

Cat No.

: SA24036

Aripiprazole, Impurities

Aripiprazole 3,4-Dichloro Analog

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CAS No.

: 203395-75-9

Mol F.

: C23H27Cl2N3O2

Mol W.

: 448.39

Cat No.

: SA24011

Aripiprazole, Impurities

Aripiprazole 3,5-Dichloro Impurity

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CAS No.

: 129722-20-9

Mol F.

: C23H27Cl2N3O2

Mol W.

: 448.4

Cat No.

: SA24037

Aripiprazole, Impurities

Aripiprazole 5-hydroxy Quinolinone Impurity | CAS : 30389-33-4

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CAS No.

: 30389-33-4

Mol F.

: C9H9NO2

Mol W.

: 136.24

Cat No.

: SA24035

Aripiprazole, Impurities

Aripiprazole 6-hydroxy Quinolinone Impurity | CAS : 54197-66-9

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CAS No.

: 54197-66-9

Mol F.

: C9H9NO2

Mol W.

: 163.2

Cat No.

: SA24034

Aripiprazole, Impurities

Aripiprazole Bromobutoxyquinoline Impurity

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CAS No.

: 129722-34-5

Mol F.

: C13H16BrNO2

Mol W.

: 298.18

Cat No.

: SA24010

Aripiprazole, Impurities

Aripiprazole Butanoic Acid Impurity

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CAS No.

: 58899-27-7

Mol F.

: C13H15NO4

Mol W.

: 249.26

Cat No.

: SA24014

Aripiprazole, Impurities

Aripiprazole Desethylene Impurity

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CAS No.

: 1216394-63-6

Mol F.

: C21H25Cl2N3O2

Mol W.

: 422.35

Cat No.

: SA24016

Aripiprazole, Impurities

Aripiprazole Methoxybutoxyquinoline Impurity

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CAS No.

: 1770391-64-4

Mol F.

: C14H19NO3

Mol W.

: 249.31

Cat No.

: SA24018

Aripiprazole, Impurities

Aripiprazole N,N-Dioxide

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CAS No.

: 573691-13-1

Mol F.

: C23H27Cl2N3O4

Mol W.

: 480.38

Cat No.

: SA24020

Aripiprazole, Impurities

Aripiprazole N4-Oxide Impurity

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CAS No.

: 573691-11-9

Mol F.

: C23H27Cl2N3O3

Mol W.

: 464.4

Cat No.

: SA24038

Aripiprazole, Impurities

Aripiprazole Piperazinyl Dimer Impurity

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CAS No.

: 1352492-04-6

Mol F.

: C37H45Cl4N5O2

Mol W.

: 733.6

Cat No.

: SA24039

Aripiprazole, Impurities

Aripiprazole Quinolinediol Impurity

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CAS No.

: 1391054-74-2

Mol F.

: C23H29Cl2N3O2

Mol W.

: 450.4

Cat No.

: SA24022

Aripiprazole, Impurities

Aripiprazole Tetrahydroquinolinyl Dimer Impurity

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CAS No.

: 1424857-63-5

Mol F.

: C36H42Cl2N4O4

Mol W.

: 665.67

Cat No.

: SA24040

Aripiprazole, Impurities

Aripiprazole USP Related Compound B

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CAS No.

: 889443-20-3

Mol F.

: C13H17NO3

Mol W.

: 235.28

Cat No.

: SA24024

Aripiprazole, Impurities

Aripiprazole USP Related Compound H

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CAS No.

: 1796928-63-6

Mol F.

: C27H35Cl2N3O3

Mol W.

: 520.49

Cat No.

: SA24013

Ascorbic Acid

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CAS No.

: 50-81-7

Mol F.

: C6H8O6

Mol W.

: 176.12

Cat No.

: SA21502

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity A

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CAS No.

: 98-01-1

Mol F.

: C5H4O2

Mol W.

: 96.08

Cat No.

: SA21503

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity C

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CAS No.

: 21675-47-8

Mol F.

: C6H10O7

Mol W.

: 194.14

Cat No.

: SA21504

Ascorbic Acid

Ascorbic Acid EP Impurity D

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CAS No.

: 67776-07-2

Mol F.

: C7H12O7

Mol W.

: 208.17

Cat No.

: SA21505

Ascorbic Acid, Impurities

Ascorbic Acid EP Impurity E

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CAS No.

: 144-62-7

Mol F.

: C2H2O4

Mol W.

: 90.03

Cat No.

: SA21506

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

Aspartame, Impurities

Aspartame

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CAS No.

: 22839-47-0

Mol F.

: C14H18N2O5

Mol W.

: 294.3

Cat No.

: SA56300