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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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Carbidopa, Impurities

Carbidopa EP Impurity C

$295.00 25 mg

In Stock

CAS No.

: 85933-19-3

Mol F.

: C11H16N2O4

Mol W.

: 240.26

Cat No.

: SA31803

Carbidopa, Impurities

Carbidopa EP Impurity D

$395.00 25 mg

In Stock

CAS No.

: 934371-48-9;91431-01-5(Rac)

Mol F.

: C17H24N2O4

Mol W.

: 320.38

Cat No.

: SA31804

Carbidopa, Impurities

Carbidopa EP Impurity E

$275.00 25 mg

In Stock

CAS No.

: 52514-63-3

Mol F.

: C11H16N2O4

Mol W.

: 240.26

Cat No.

: SA31805

Carbidopa, Impurities

Carbidopa EP Impurity F

$295.00 25 mg

In Stock

CAS No.

: 96115-88-7; 91908-71-3 (base)

Mol F.

: C12H19ClN2O4

Mol W.

: 290.74

Cat No.

: SA31806

Carbidopa, Impurities

Carbidopa EP Impurity G

$95.00 25 mg

In Stock

CAS No.

: 2503-44-8

Mol F.

: C9H10O3

Mol W.

: 166.17

Cat No.

: SA31807

Carbidopa, Impurities

Carbidopa EP Impurity H

$295.00 25 mg

In Stock

CAS No.

: 1361017-74-4

Mol F.

: C11H16N2O4

Mol W.

: 240.26

Cat No.

: SA31808

Carbidopa, Impurities

Carbidopa Imine Ester Impurity

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C14H20N2O4

Mol W.

: 280.32

Cat No.

: SA31811

Carfilzomib, Impurities

Carfilzomib 3-Phenylpropanoic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 868540-16-3

Mol F.

: C31H42N4O6

Mol W.

: 566.69

Cat No.

: SA45008

Carisoprodol, Impurities

Carisoprodol EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 78-26-2

Mol F.

: C₇H₁₆O₂

Mol W.

: 132.2

Cat No.

: SA25304

Carisoprodol, Impurities

Carisoprodol EP Impurity D; Meprobamate

Please enquire for price & pack size

In Stock

CAS No.

: 57-53-4

Mol F.

: C9H18N2O4

Mol W.

: 218.25

Cat No.

: SA25301

Carvedilol, Impurities

Carvedilol Nitroso Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2248746-67-8

Mol F.

: C24H25N3O5

Mol W.

: 435.5

Cat No.

: SA31722

Cefaclor

Cefaclor dimer

Please enquire for price & pack size

In Stock

CAS No.

: 142975-51-7

Mol F.

: C32H26Cl2F3N6O9S2

Mol W.

: 830.62

Cat No.

: SA18710

Cefaclor, Impurities

Cefaclor EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 143059-69-2

Mol F.

: C15H14ClN3O4S

Mol W.

: 367.81

Cat No.

: SA18701

Cefaclor, Impurities

Cefaclor EP Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 2882-18-0

Mol F.

: C10H8N2O

Mol W.

: 172.18

Cat No.

: SA18703

Cefaclor, Impurities

Cefaclor EP Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C23H21ClN4O5S

Mol W.

: 500.95

Cat No.

: SA18705

Cefadroxil, Impurities

Cefadroxil Dimer Trifluoroacetate

Please enquire for price & pack size

In Stock

CAS No.

: 2378158-45-1

Mol F.

: C32H32N6O9S2

Mol W.

: 708.8

Cat No.

: SA42307

Cefadroxil, Impurities

Cefadroxil Ethyl Analog

Please enquire for price & pack size

In Stock

CAS No.

: 2243976-70-5

Mol F.

: C17H19N3O5S

Mol W.

: 377.4

Cat No.

: SA42305

Cephalexin, Impurities

Cefalexin EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 875-74-1

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA12014

Cephalexin, Impurities

Cefalexin EP Impurity B; 7-Aminodesacetoxycephalosporanic acid

Please enquire for price & pack size

In Stock

CAS No.

: 22252-43-3

Mol F.

: C8H10N2O3S

Mol W.

: 214.24

Cat No.

: SA12001

Cephalexin, Impurities

Cefalexin EP Impurity C; Phenylglycyl Cephalexin TFA Salt

Please enquire for price & pack size

In Stock

CAS No.

: 72528-40-6(base)

Mol F.

: C24H24N4O5S. C2F3O

Mol W.

: 577.55

Cat No.

: SA12009

Cephalexin, Impurities

Cefalexin EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 34876-35-2

Mol F.

: C5H6O2S

Mol W.

: 130.16

Cat No.

: SA12012

Cephalexin, Impurities

Cefalexin EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 146794-70-9

Mol F.

: C13H18N2O4S

Mol W.

: 298.36

Cat No.

: SA12002

Cephalexin, Impurities

Cefalexin Sulfoxide

Please enquire for price & pack size

In Stock

CAS No.

: 56193-21-6

Mol F.

: C16H17N3O5S

Mol W.

: 363.39

Cat No.

: SA12003

Cefprozil, Impurities

Cefprozil Amide

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C26H26N4O7S

Mol W.

: 538.57000000000005

Cat No.

: SA31919

Cefprozil, Impurities

Cefprozil EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 22818-40-2

Mol F.

: C8H9NO3

Mol W.

: 167.16

Cat No.

: SA31901

Cefprozil, Impurities

Cefprozil EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 106447-44-3

Mol F.

: C10H12N2O3S

Mol W.

: 240.28

Cat No.

: SA31904

Cefprozil, Impurities

Cefprozil EP Impurity M

Please enquire for price & pack size

In Stock

CAS No.

: 1605314-84-8

Mol F.

: C21H23N3O7S

Mol W.

: 461.49

Cat No.

: SA31913

Celecoxib, Impurities

Celecoxib EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 170570-01-1

Mol F.

: C17H14F3N3O2S

Mol W.

: 381.37

Cat No.

: SA11305

Celecoxib, Impurities

Celecoxib Schiff’s Base Analog

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C15H17N3O2S

Mol W.

: 303.38

Cat No.

: SA11303

Celiprolol, Impurities

Celiprolol EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 57471-01-9

Mol F.

: C20H33N3O4

Mol W.

: 379.49

Cat No.

: SA38503

Cephalexin, Impurities

Cephalexin Dimer

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C32H32N6O7S2

Mol W.

: 676.76

Cat No.

: SA12007

Cefprozil, Impurities

Ceprozil delta-3-isomer

Please enquire for price & pack size

In Stock

CAS No.

: 1000980-59-5

Mol F.

: C18H19N3O5S

Mol W.

: 389.43

Cat No.

: SA31917

Cetirizine, Impurities

Cetirizine 1-[(4-Chlorophenyl)phenylmethyl]piperazine Amide; Cetirizine Dimer

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C₃₈H₄₂Cl₂N₄O₂

Mol W.

: 657.67

Cat No.

: SA13509

Cetirizine, Impurities

Cetirizine 4-methoxybenzyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C25H27ClN2O : C3H4O4

Mol W.

: 406.95:104.06

Cat No.

: SA13513

Cetirizine, Impurities

Cetirizine Glycol Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 324047-29-2

Mol F.

: C23H29ClN2O4

Mol W.

: 432.9

Cat No.

: SA13514

Emtricitabine, Impurities

CFTU1/CFTU2 (Mixture)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C8H9FN2O4S

Mol W.

: 248.23

Cat No.

: SA22929

Impurities, Ursodiol

Chenodeoxycholic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 474-25-9

Mol F.

: C24H40O4

Mol W.

: 392.57

Cat No.

: SA31201

Impurities, Loteprednol

Chlormethyl 17α-ethoxycarbonyloxy-3-oxoandrosta-1,4,9(11)-triene-17β-carboxylate, ∆9 (11) 17-ethylcarbonate Lotepredenol

Please enquire for price & pack size

In Stock

CAS No.

: 207670-55-1

Mol F.

: C24H29ClO6

Mol W.

: 448.94

Cat No.

: SA27613

Bosentan, Impurities

Chloro Bosentan

Please enquire for price & pack size

In Stock

CAS No.

: 150727-06-3

Mol F.

: C25H24ClN5O4S

Mol W.

: 526.01

Cat No.

: SA28607

Cephalexin, Impurities

Chloro Cephalexin Impurity | CAS : 22039-59-4

Please enquire for price & pack size

In Stock

CAS No.

: 22039-59-4

Mol F.

: C16H16ClN3O4S

Mol W.

: 381.83

Cat No.

: SA12018

Fluticasone Furoate, Impurities

Chloro Fluticasone Furoate

$400.00 50 mg

In Stock

CAS No.

Mol F.

: C27H29ClF2O6S

Mol W.

: 555.03

Cat No.

: SA48213

Fluticasone Propionate, Impurities

Chloro Fluticasone Propionate

$300.00 25 mg

In Stock

CAS No.

: 80486-69-7

Mol F.

: C25H31ClF2O5S

Mol W.

: 517.03

Cat No.

: SA47013

Impurities, Nitrofurantoin

Chlorofurantoin

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: CˆH†ClNƒOƒ

Mol W.

: 227.6

Cat No.

: SA39807

Impurities, Loteprednol

Chloromethyl 9-chloro-17α-ethoxycarbonyloxy-11β-hydroxy-3-oxoandrosta-1,4-diene-17β-carboxylate

Please enquire for price & pack size

In Stock

CAS No.

: 207670-58-4

Mol F.

: C24H30Cl2O7

Mol W.

: 501.4

Cat No.

: SA27612

Impurities, Loteprednol

Chloromethyl 9,11-dichloro-17α-ethoxycarbonyloxy-3-oxoandrosta-1,4-diene-17β-carboxylate

Please enquire for price & pack size

In Stock

CAS No.

: 207670-57-3

Mol F.

: C24H29Cl3O6

Mol W.

: 519.84

Cat No.

: SA27614

Apixaban, Impurities

Chloropentanamide Ethyl Ester Apixaban Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C27H27ClN4O5

Mol W.

: 522.98

Cat No.

: SA39915

Colesevelam, Impurities

Chloroquat

$70.00 25 mg

In Stock

CAS No.

: 93199-84-9

Mol F.

: C9H21BrClN

Mol W.

: 258.63

Cat No.

: SA10209

Chlorpromazine, Impurities

Chlorpromazine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 969-99-3

Mol F.

: C17H19ClN2OS

Mol W.

: 334.86

Cat No.

: SA21605

Chlorpromazine, Impurities

Chlorpromazine EP Impurity B

$155.00 25 mg

In Stock

CAS No.

: 19077-20-4

Mol F.

: C21H28ClN3S

Mol W.

: 389.99

Cat No.

: SA21606

Chlorpromazine, Impurities

Chlorpromazine EP Impurity D

$115.00 50 mg

In Stock

CAS No.

: 3953-65-9

Mol F.

: C16H17ClN2S

Mol W.

: 304.84

Cat No.

: SA21608