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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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Impurities, Propranolol

RS-12:1-[(1-Methylethyl) amino]-3-(2-naphthalenyloxy)-2-propanol

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In Stock

CAS No.

: NA

Mol F.

: C16H21NO2

Mol W.

: 259.34

Cat No.

: SA24615

Edoxaban, Impurities

RSR-Edoxaban

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In Stock

CAS No.

: 1255529-23-7

Mol F.

: C24H30ClN7O4S

Mol W.

: 548.06

Cat No.

: SA33004

Edoxaban, Impurities

RSS Boc-Cyclohexyl Isomer of Edoxaban | CAS : 365998-36-3

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In Stock

CAS No.

: 365998-36-3

Mol F.

: C14H27N3O3

Mol W.

: 671.87

Cat No.

: SA33053

Impurities, Sitagliptin

S-Sitagliptin N-Boc impurity

$250.00 25 mg

In Stock

CAS No.

Mol F.

: C21H23F6N5O3

Mol W.

: 507.43

Cat No.

: SA10418

Impurities, Salbutamol

Salbutamol EP Impurity B

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In Stock

CAS No.

: 96948-64-0

Mol F.

: C12H19NO2

Mol W.

: 209.28

Cat No.

: SA26001

Impurities, Salbutamol

Salbutamol EP Impurity C

$300.00 25 mg

In Stock

CAS No.

: 18910-68-4

Mol F.

: C13H21NO2

Mol W.

: 223.31

Cat No.

: SA26002

Impurities, Salbutamol

Salbutamol EP Impurity E; N-Benzyl Albuterol

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In Stock

CAS No.

: 24085-03-8

Mol F.

: C20H27NO3

Mol W.

: 329.43

Cat No.

: SA26004

Salbutamol

Salbutamol EP Impurity F; Albuterol Dimer Ether

$900.00 25 mg

In Stock

CAS No.

: 147663-30-7

Mol F.

: C26H40N2O5

Mol W.

: 460.61

Cat No.

: SA26005

Impurities, Salbutamol

Salbutamol EP Impurity I; 4-Benzyl Albuterol

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In Stock

CAS No.

: 56796-66-8

Mol F.

: C20H27NO3

Mol W.

: 329.43

Cat No.

: SA26008

Salbutamol

Salbutamol EP Impurity J; Albuterol USP RC B

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In Stock

CAS No.

: 156547-62-5(base);41489-89-8(HClSalt)

Mol F.

: C13H19NO3

Mol W.

: 237.29

Cat No.

: SA26009

Impurities, Salbutamol

Salbutamol EP Impurity M; O-Methyl Albuterol

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In Stock

CAS No.

: 18910-70-8

Mol F.

: C14H23NO3

Mol W.

: 253.34

Cat No.

: SA26012

Impurities, Salbutamol

Salbutamol EP Impurity N; Albuterol Dimer

$900.00 25 mg

In Stock

CAS No.

: 149222-15-1

Mol F.

: C26H40N2O5

Mol W.

: 460.61

Cat No.

: SA26013

Impurities, Salbutamol

Salbutamol Impurity O

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In Stock

CAS No.

: 2387728-91-6

Mol F.

: C15H25NO3

Mol W.

: 267.4

Cat No.

: SA26018

Aspirin, Impurities

Salicylic Acid

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In Stock

CAS No.

: 69-72-7

Mol F.

: C₇H₆O₃

Mol W.

: 138.12

Cat No.

: SA28512

Impurities, Salmeterol

Salmeterol

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In Stock

CAS No.

: 89365-50-4

Mol F.

: C₂₅H₃₇NO₄

Mol W.

: 415.57

Cat No.

: SA10100

Impurities, Salmeterol

Salmeterol EP Impurity A

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In Stock

CAS No.

: 1798014-51-3

Mol F.

: C₁₉H₂₅NO₃

Mol W.

: 315.41

Cat No.

: SA10105

Impurities, Salmeterol

Salmeterol EP Impurity B

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In Stock

CAS No.

: 94749-02-7

Mol F.

: C23H33NO4

Mol W.

: 387.51

Cat No.

: SA10101

Impurities, Salmeterol

Salmeterol EP impurity C

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In Stock

CAS No.

: 94749-11-8

Mol F.

: C24H35NO4

Mol W.

: 401.54

Cat No.

: SA10102

Impurities, Salmeterol

Salmeterol EP Impurity E

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In Stock

CAS No.

: 108928-81-0

Mol F.

: C25H37NO4

Mol W.

: 415.57

Cat No.

: SA10103

Impurities, Salmeterol

Salmeterol EP Impurity F

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In Stock

CAS No.

: 1391054-40-2

Mol F.

: C25H37NO3

Mol W.

: 399.57

Cat No.

: SA10104

Impurities, Salmeterol

Salmeterol Xinafoate API

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In Stock

CAS No.

: 94749-08-3

Mol F.

: C36H45NO7

Mol W.

: 603.75

Cat No.

: SA10110

Aspirin, Impurities

Salsalate

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In Stock

CAS No.

: 552-94-3

Mol F.

: C14H10O5

Mol W.

: 258.23

Cat No.

: SA28513

Impurities, Saxagliptin

Saxagliptin Carboxylic Acid Impurity

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In Stock

CAS No.

: 1802786-89-5

Mol F.

: C18H26N2O4

Mol W.

: 334.41

Cat No.

: SA27402

Impurities, Tiotropium

Scopine Hydrochloride

$100.00 25 mg

In Stock

CAS No.

: 85700-55-6

Mol F.

: C8H14ClNO2

Mol W.

: 191.66

Cat No.

: SA11715

Impurities, Tiotropium

Scopoline

$130.00 25 mg

In Stock

CAS No.

: 487-27-4

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA11719

Impurities, Sertraline

Sertraline Tetralone

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In Stock

CAS No.

: 79560-19-3

Mol F.

: C16H12Cl2O

Mol W.

: 291.17

Cat No.

: SA36517

Impurities, Sitagliptin

Sitagliptin Acid Impurity

$78.00 25 mg

In Stock

CAS No.

: 936630-57-8; 1204818-19-8

Mol F.

: C10H10F3NO2

Mol W.

: 233.19

Cat No.

: SA10416

Impurities, Sitagliptin

Sitagliptin Dimer Impurity

$250.00 25 mg

In Stock

CAS No.

: 2072867-07-1

Mol F.

: C26H23F9N6O2

Mol W.

: 622.49

Cat No.

: SA10417

Impurities, Sitagliptin

Sitagliptin Enamine Impurity

$78.00 25 mg

In Stock

CAS No.

: 767340-03-4

Mol F.

: C16H13F6N5O

Mol W.

: 405.3

Cat No.

: SA10414

Impurities, Sitagliptin

Sitagliptin Fumarate Adduct

$299.00 25 mg

In Stock

CAS No.

: 2088771-60-0

Mol F.

: C20H19F6N5O5

Mol W.

: 523.39

Cat No.

: SA10402

Impurities, Sitagliptin

Sitagliptin impurity 16

$395.00 25 mg

In Stock

CAS No.

: 769195-20-2

Mol F.

: C24H22F6N6O2

Mol W.

: 540.5

Cat No.

: SA10451

Impurities, Sitagliptin

Sitagliptin Ketoamide Impurity

$80.00 25 mg

In Stock

CAS No.

: 764667-65-4

Mol F.

: C16H12F6N4O2

Mol W.

: 406.28

Cat No.

: SA10403

Impurities, Sitagliptin

Sitagliptin Oxo-Impurity

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C16H13F6N5O2

Mol W.

: 421.3

Cat No.

: SA10415

Impurities, Sitagliptin

Sitagliptin S-Isomer

$250.00 25 mg

In Stock

CAS No.

: 823817-58-9 (Phosphate); 823817-55-6

Mol F.

: C16H15F6N5O

Mol W.

: 407.31

Cat No.

: SA10401

Impurities, Sitagliptin

Sitagliptin Styrylacetyl Analog

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In Stock

CAS No.

: 1675201-14-5; 1803026-58-5

Mol F.

: C16H12F6N4O

Mol W.

: 390.28

Cat No.

: SA10404

Impurities, Sitagliptin

Sitagliptin Tablets EP Impurity FP-D; Sitagliptin Phenyl Crotonyl Impurity; Enone SLP

$195.00 25 mg

In Stock

CAS No.

: 1253056-18-6

Mol F.

: C16H2F6N4O

Mol W.

: 390.28

Cat No.

: SA10421

Impurities, Sitagliptin

Sitagliptin Triazecine Impurity

$595.00 25 mg

In Stock

CAS No.

: 2088771-61-1

Mol F.

: C16H13F6N5O2

Mol W.

: 421.3

Cat No.

: SA10422

Impurities, Sofosbuvir

Sofosbuvir 3′-O-Phosphoramidate

$255.00 10 mg

In Stock

CAS No.

: 1337482-15-1

Mol F.

: C22H29FN3O9P

Mol W.

: 529.45

Cat No.

: SA15408

Impurities, Sofosbuvir

Sofosbuvir 3′,5′-Bis-O-Phosphoramidate

$195.00 10 mg

In Stock

CAS No.

: 1337482-17-3

Mol F.

: C34H45FN4O13P2

Mol W.

: 798.69

Cat No.

: SA15407

Impurities, Sofosbuvir

Sofosbuvir Chloro Analog; Chloro Sofosbuvir

$495.00 10 mg

In Stock

CAS No.

: 1496552-51-2

Mol F.

: C22H29ClN3O9P

Mol W.

: 545.13

Cat No.

: SA15420

Impurities, Sofosbuvir

Sofosbuvir Impurity SA15413; 2′-Alkene tribenzoyl cytidine

$395.00 25 mg

In Stock

CAS No.

: 863329-63-9

Mol F.

: C31H25N3O7

Mol W.

: 551.55

Cat No.

: SA15413

Impurities, Sofosbuvir

Sofosbuvir impurity SA15432

$100.00 100 mg

In Stock

CAS No.

: 863329-66-2

Mol F.

: C10H13FN2O5

Mol W.

: 260.22

Cat No.

: SA15432

Impurities, Sofosbuvir

Sofosbuvir Impurity SA15434; Sofosbuvir metabolites

$395.00 10 mg

In Stock

CAS No.

: 1859162-80-3

Mol F.

: C16H18FN2O8P

Mol W.

: 416.29

Cat No.

: SA15434

Impurities, Sofosbuvir

Sofosbuvir Impurity SA15435

$695.00 25 mg

In Stock

CAS No.

Mol F.

: C31H26ClN3O7

Mol W.

: 588.01

Cat No.

: SA15435

Impurities, Sofosbuvir

Sofosbuvir α-isomer

$255.00 10 mg

In Stock

CAS No.

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15402

Edoxaban, Impurities

SRR Boc-Cyclohexyl Enantiomer of Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 2089454-69-1

Mol F.

: C14H27N3O3

Mol W.

: 285.38

Cat No.

: SA33017

Ezetimibe, Impurities

SRR uncyclized ezetimibe impurity

$250.00 25 mg

In Stock

CAS No.

: 1621715-63-6

Mol F.

: C33H30F2N2O5

Mol W.

: 572.6

Cat No.

: SA14838

Ezetimibe, Impurities

SS-Ezetimibe Ketone

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H19F2NO3

Mol W.

: 407.41

Cat No.

: SA14857

Edoxaban, Impurities

SSR Boc-Cyclohexyl Diastereomer of Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 2081883-50-1

Mol F.

: C14H27N3O3

Mol W.

: 285.39

Cat No.

: SA33022

Edoxaban, Impurities

SSR-Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 1255529-28-2

Mol F.

: C25H31ClN6O4S

Mol W.

: 547.07

Cat No.

: SA33002