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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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Fosaprepitant, Impurities

N-Benzyl morpholinone impurity

$350.00 25 mg

In Stock

CAS No.

Mol F.

: C21H19F6NO3

Mol W.

: 447.37

Cat No.

: SA45420

Impurities, Nebivolol

N-Benzyl Nebivolol (Mixture of diasteromers)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C29H31F2NO4

Mol W.

: 495.56

Cat No.

: SA14707

Aminocaproic Acid, Impurities

N-Benzyloxycarbonyl-6-aminocaproic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 1947-00-8

Mol F.

: C₁₄H₁₉NO₄

Mol W.

: 265.3

Cat No.

: SA22608

Diltiazem, Impurities

N-Boc Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 1289643-62-4

Mol F.

: C25H30N2O6S

Mol W.

: 486.58

Cat No.

: SA19517

Impurities, Linagliptin

N-Boc Linagliptin

Please enquire for price & pack size

In Stock

CAS No.

: 668273-75-4

Mol F.

: C30H36N8O4

Mol W.

: 572.66

Cat No.

: SA49904

Impurities, Linagliptin

N-Boc Linagliptin Bromo Impurity D

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H37BrN8O4

Mol W.

: 653.57

Cat No.

: SA49952

Impurities, Sitagliptin

N-Boc Oxo Sitagliptin Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C21H21F6N5O4

Mol W.

: 521.41

Cat No.

: SA10449

Impurities, Sitagliptin

N-Boc Sitagliptin Acid Impurity

$80.00 25 mg

In Stock

CAS No.

: 486460-00-8

Mol F.

: C15H18F3NO4

Mol W.

: 333.3

Cat No.

: SA10419

Impurities, Sitagliptin

N-Boc triazolo[4,3-a]pyrazine Impurity

$80.00 25 mg

In Stock

CAS No.

: 877402-43-2

Mol F.

: C11H15F3N4O2

Mol W.

: 292.26

Cat No.

: SA10431

Impurities, Sitagliptin

N-Boc-Sitagliptin

$95.00 25 mg

In Stock

CAS No.

: 486460-23-5

Mol F.

: C21H23F6N5O3

Mol W.

: 507.43

Cat No.

: SA10407

Impurities, Sitagliptin

N-butanoyl Sitagliptin

$175.00 25 mg

In Stock

CAS No.

Mol F.

: C21H23FN5O2

Mol W.

: 491.43

Cat No.

: SA10405

Efavirenz, Impurities

N-Carbamate open ring Efavirenz

Please enquire for price & pack size

In Stock

CAS No.

: 211563-40-5

Mol F.

: C15H13ClF3NO3

Mol W.

: 347.72

Cat No.

: SA17610

Carbamazepine, Impurities

N-Carbamoyl Oxcarbazepine

$295.00 25 mg

In Stock

CAS No.

: 2642430-30-4

Mol F.

: C16H16N3O3

Mol W.

: 295.29

Cat No.

: SA20335

Clarithromycin, Impurities

N-Demethyl-N-formyl Clarithromycin

Please enquire for price & pack size

In Stock

CAS No.

: 127140-69-6

Mol F.

: C38H67NO14

Mol W.

: 761.94

Cat No.

: SA17202

Impurities, Linagliptin

N-Depiperidin-3-Amine Linagliptin Dimer

Please enquire for price & pack size

In Stock

CAS No.

: 2253964-98-4

Mol F.

: C45H44N14O4

Mol W.

: 844.92

Cat No.

: SA49936

Bumetanide, Impurities

N-Desbutyl-N-propyl Bumetanide

$250.00 25 mg

In Stock

CAS No.

: 28395-28-0

Mol F.

: C16H18N2O5S

Mol W.

: 350.39

Cat No.

: SA24405

Diltiazem, Impurities

N-Desdimethylaminoethyl O-Desacetyl Diltiazem 2-Epimer

$595.00 25 mg

In Stock

CAS No.

: 30825-34-4

Mol F.

: C16H15NO3S

Mol W.

: 301.36

Cat No.

: SA19524

Impurities, Loratadine

N-Desmethyl Azatadine

$255.00 25 mg

In Stock

CAS No.

: 38092-95-4

Mol F.

: C19H20N2

Mol W.

: 276.38

Cat No.

: SA34031

Clarithromycin, Impurities

N-Desmethyl Clarithromycin

Please enquire for price & pack size

In Stock

CAS No.

: 101666-68-6

Mol F.

: C37H67NO13

Mol W.

: 733.93

Cat No.

: SA17201

Edoxaban, Impurities

N-Desmethyl Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 480449-52-3

Mol F.

: C23H28ClN7O4S

Mol W.

: 534.03

Cat No.

: SA33009

Impurities, Venlafaxine

N-Desmethyl Elimination Impurity

$795.00 50 mg

In Stock

CAS No.

Mol F.

: C16H23NO

Mol W.

: 245.36

Cat No.

: SA22737

Impurities, Nintedanib

N-Desmethyl Nintedanib

Please enquire for price & pack size

In Stock

CAS No.

: 334951-61-0

Mol F.

: C30H31N5O4

Mol W.

: 525.6

Cat No.

: SA22531

Impurities, Terbinafine

N-Desmethyl Terbinafine

Please enquire for price & pack size

In Stock

CAS No.

: 99473-11-7

Mol F.

: C20H23N

Mol W.

: 277.71

Cat No.

: SA25719

Diltiazem, Impurities

N-Desmethyl-N-acetyl Diltiazem

$295.00 25 mg

In Stock

CAS No.

: 86408-44-8

Mol F.

: C23H26N2O5S

Mol W.

: 442.53

Cat No.

: SA19515

Cephalexin, Impurities

N-Ethoxycarbonyl-7-ADCA

Please enquire for price & pack size

In Stock

CAS No.

: 72820-16-7

Mol F.

: C11H14N2O5S

Mol W.

: 286.3

Cat No.

: SA12004

Apremilast, Impurities

N-Formyl Apremilast Imp

$255.00 25 mg

In Stock

CAS No.

: 2077897-94-8

Mol F.

: C21H22N2O7S

Mol W.

: 446.47

Cat No.

: SA30019

Impurities, Oxcarbazepine

N-Formyl Oxcarbazepine; Oxcarbazepine EP Impurity K

$255.00 25 mg

In Stock

CAS No.

: 1346601-76-0

Mol F.

: C16H12N2O3

Mol W.

: 280.28

Cat No.

: SA12504

Valacyclovir

N-Formyl Valacyclovir

Please enquire for price & pack size

In Stock

CAS No.

: 847670-62-6

Mol F.

: 352.35

Mol W.

: C14H20N6O5

Cat No.

: SA49502

Impurities, Lorcaserin

N-Hydroxy Lorcaserin

Please enquire for price & pack size

In Stock

CAS No.

: 1421747-19-4

Mol F.

: C11H14ClNO

Mol W.

: 211.69

Cat No.

: SA18805

Azilsartan, Impurities

N-Methyl Azilsartan Medoxomil

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C31H26N4O8

Mol W.

: 582.56

Cat No.

: SA42809

Impurities, Palbociclib

N-Methyl Palbociclib

Please enquire for price & pack size

In Stock

CAS No.

: 571189-51-0

Mol F.

: C25H31N7O2

Mol W.

: 461.56

Cat No.

: SA40408

Impurities, Ticagrelor

N-Nitrosamine Ticagrelor

Please enquire for price & pack size

In Stock

CAS No.

: 2476859-55-7

Mol F.

: C23H27F2N7O5S

Mol W.

: 551.57

Cat No.

: SA32526

Impurities, Nitrosamine, Tofacitinib

N-Nitroso 5,6-Dihydro Tofacitinib

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C16H21N7O2

Mol W.

: 343.4

Cat No.

: SA43327

Apixaban, Impurities

N-Nitroso Apixaban Amino Acid Impurity

$450.00 25 mg

In Stock

CAS No.

Mol F.

: C25H26N6O6

Mol W.

: 506.5

Cat No.

: SA39939

Impurities, Nitrosamine

N-Nitroso Atazanavir

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C8H13N3OS

Mol W.

: 199.27

Cat No.

: SA44680

Atropine, Impurities, Nitrosamine

N-Nitroso Atropine

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C16H20N2O4

Mol W.

: 304.34

Cat No.

: SA47712

Impurities, Nitrosamine

N-Nitroso Azacyclonal

Please enquire for price & pack size

In Stock

CAS No.

: 1038-06-8

Mol F.

: C18H20N2O2

Mol W.

: 296.39999999999998

Cat No.

: SA44622

Benazepril, Impurities, Nitrosamine

N-Nitroso Benazepril

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H27N3O6

Mol W.

: 453.49

Cat No.

: SA29612

Impurities, Nitrosamine

N-Nitroso Bis(2-chloroethyl)amine

Please enquire for price & pack size

In Stock

CAS No.

: 67856-68-2

Mol F.

: C4H8Cl2N2O

Mol W.

: 171.03

Cat No.

: SA44663

Brimonidine, Impurities, Nitrosamine

N-Nitroso Brimonidine

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C11H9BrN6O

Mol W.

: 321.13

Cat No.

: SA20728

Brinzolamide, Impurities

N-Nitroso Brinzolamide

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C12H20N4O6S3

Mol W.

: 412.51

Cat No.

: SA47206

Bupropion, Impurities, Nitrosamine

N-Nitroso Bupropion

$125.00 50 mg

In Stock

CAS No.

: 2763780-10-3

Mol F.

: C13H17ClN2O2

Mol W.

: 268.74

Cat No.

: SA12238

Bupropion, Impurities

N-Nitroso Bupropion 3,5-Dichloro Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C13H16Cl2N2O2

Mol W.

: 303.18

Cat No.

: SA12246

Bupropion, Impurities

N-Nitroso Bupropion USP Related Compound A

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C13H17ClN2O2

Mol W.

: 268.7

Cat No.

: SA12243

Bupropion, Impurities

N-Nitroso Bupropion USP Related Compound B

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C13H17BrN2O2

Mol W.

: 313.19

Cat No.

: SA12244

Buspirone, Impurities, Nitrosamine

N-Nitroso Buspirone Impurity 1

Please enquire for price & pack size

In Stock

CAS No.

: 872826-80-7

Mol F.

: C8H11N5O

Mol W.

: 193.2

Cat No.

: SA25819

Cetirizine, Impurities, Nitrosamine

N-Nitroso Cetirizine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C17H18ClN3O

Mol W.

: 315.8

Cat No.

: SA44620

Ciprofloxacin, Impurities, Nitrosamine

N-Nitroso Ciprofloxacin

Please enquire for price & pack size

In Stock

CAS No.

: 864443-44-7

Mol F.

: C17H17FN4O4

Mol W.

: 360.12

Cat No.

: SA34713

Impurities, Nitrosamine

N-Nitroso Dabigatran Etexilate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C34H40N8O6

Mol W.

: 656.73

Cat No.

: SA446101

Bupropion, Impurities

N-Nitroso Deschloro Bupropion

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C13H18N2O2

Mol W.

: 234.29

Cat No.

: SA12242