Home / Products / Impurities

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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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

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

Chlorpheniramine, Impurities

Chlorphenamine Di-N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 3054291-23-2

Mol F.

: C16H19ClN2O2

Mol W.

: 306.79

Cat No.

: SA37610

Chlorpheniramine

Chlorphenamine; Chlorpheniramine

Please enquire for price & pack size

In Stock

CAS No.

: 132-22-9; 113-92-8 (Maleate Salt); 56343-98-7 (HCl Salt)

Mol F.

: C16H19ClN2

Mol W.

: 274.79

Cat No.

: SA37600

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

Chlorpromazine, Impurities

Chlorpromazine EP Impurity E

$75.00 25 mg

In Stock

CAS No.

: 92-39-7

Mol F.

: C12H8ClNS

Mol W.

: 233.72

Cat No.

: SA21609

Chlorpromazine, Impurities

Chlorpromazine N-Oxide

$115.00 25 mg

In Stock

CAS No.

: 18683-80-2

Mol F.

: C17H19ClN2OS

Mol W.

: 334.86

Cat No.

: SA21617

Chlorpromazine, Impurities

Chlorpromazine N-Oxide Sulfoxide

$175.00 50 mg

In Stock

CAS No.

: 10404-90-7

Mol F.

: C17H19ClN2O2S

Mol W.

: 350.86

Cat No.

: SA21612

Chlorthalidone, Impurities

Chlorthalidone Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 5270-74-6

Mol F.

: C14H10ClNO5S

Mol W.

: 339.75

Cat No.

: SA22401

Chlorthalidone, Impurities

Chlorthalidone Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 92874-73-2

Mol F.

: C₁₆H₁₄ClNO₅S

Mol W.

: 367.8

Cat No.

: SA22402

Chlorthalidone, Impurities

Chlorthalidone Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 1369588-00-0 (monohydrate); 1369995-36-7(anhydrate)

Mol F.

: C16H15ClN2O4S

Mol W.

: 366.82

Cat No.

: SA22403

Chlorthalidone, Impurities

Chlorthalidone Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 82875-49-8

Mol F.

: C14H11ClN2O3S

Mol W.

: 322.77

Cat No.

: SA22404

Chlorthalidone, Impurities

Chlorthalidone Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 16289-13-7

Mol F.

: C14H9Cl2NO2

Mol W.

: 294.13

Cat No.

: SA22406

Chlorthalidone, Impurities

Chlorthalidone Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: 2200280-98-2

Mol F.

: C17H17ClN2O4S

Mol W.

: 380.85

Cat No.

: SA22407

Chlorthalidone, Impurities

Chlorthalidone Impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 2514668-27-8

Mol F.

: C17H16ClNO5S

Mol W.

: 381.83

Cat No.

: SA22408

Chlorthalidone, Impurities

Chlorthalidone Impurity J

Please enquire for price & pack size

In Stock

CAS No.

: 956-92-3

Mol F.

: C14H10ClNO2

Mol W.

: 259.69

Cat No.

: SA22410

Chlorthalidone, Impurities

Chlorthalidone Methyl ether

Please enquire for price & pack size

In Stock

CAS No.

: 96512-76-4

Mol F.

: C15H13ClN2O4S

Mol W.

: 352.79

Cat No.

: SA22409

Impurities, Ursodiol

Cholic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 81-25-4

Mol F.

: C24H40O5

Mol W.

: 408.57

Cat No.

: SA31202

Ciclesonide, Impurities

Ciclesonide EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C32H44O7

Mol W.

: 540.69

Cat No.

: SA49101

Ciclesonide

Ciclesonide EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 161115-59-9

Mol F.

: C28H38O6

Mol W.

: 470.6

Cat No.

: SA49102

Cinnarizine, Impurities

Cinnarizine EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 216581-01-0 (base); 56265-29-3 (dihydrochloridesalt)

Mol F.

: C30H30N2

Mol W.

: 418.5

Cat No.

: SA12402

Ciprofloxacin, Impurities

Ciprofloxacin 6-Chloro impurity

$255.00 25 mg

In Stock

CAS No.

: 93106-58-2

Mol F.

: C17H18ClN3O3

Mol W.

: 347.8

Cat No.

: SA34707

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity E

$155.00 25 mg

In Stock

CAS No.

: 105394-83-0

Mol F.

: C16H18FN3O

Mol W.

: 287.33

Cat No.

: SA34705

Paroxetine

cis-(+)-Paroxetine Hydrochloride; Paroxetine impurity E

$295.00 25 mg

In Stock

CAS No.

: 1396174-70-1

Mol F.

: C19H20FNO3

Mol W.

: 365.83

Cat No.

: SA18305

Impurities, Praziquantel

cis-Hydroxy Praziquantel

$120.00 25 mg

In Stock

CAS No.

: 134924-68-8

Mol F.

: C19H24N2O3

Mol W.

: 328.41

Cat No.

: SA13905

Impurities, Permethrin

cis-Permethrin | CAS : 61949-77-6

Please enquire for price & pack size

In Stock

CAS No.

: 61949-77-6

Mol F.

: C21H20Cl2O3

Mol W.

: 391.29

Cat No.

: SA51902

Citalopram, Impurities

Citalopram

Please enquire for price & pack size

In Stock

CAS No.

: 207559-01-1

Mol F.

: C22H23FN2O5

Mol W.

: 414.43

Cat No.

: SA17019

Citalopram, Impurities

Citalopram Carboxylic Acid Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 440121-09-5(base)

Mol F.

: C20H23BrFNO3

Mol W.

: 424.3

Cat No.

: SA17002

Citalopram, Impurities

Citalopram Chloromethyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C21H23Cl2FN2O

Mol W.

: 409.32

Cat No.

: SA17022

Citalopram, Impurities

Citalopram Didesmethyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1189694-81-2 (HCl salt); 62498-69-5 (base)

Mol F.

: C18H17FN2O (Free Base), C18H18ClFN2O (HCl salt)

Mol W.

: 296.37,332.80(HClsalt)

Cat No.

: SA17003

Citalopram, Impurities

Citalopram Dihydroxy Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 103146-26-5 (HBr salt); 103146-25-4 (base); 717133-25-0 (HCl Salt)

Mol F.

: C20H28BrFN2O2

Mol W.

: 427.35

Cat No.

: SA17004

Citalopram, Impurities

Citalopram EP Impurity A; Citalopram Related Compound A

Please enquire for price & pack size

In Stock

CAS No.

: 64372-56-1

Mol F.

: C20H23FN2O2

Mol W.

: 342.41

Cat No.

: SA17005

Citalopram, Impurities

Citalopram EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 411221-53-9

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA17006

Citalopram

Citalopram EP Impurity C; Citalopram Related Compound C

Please enquire for price & pack size

In Stock

CAS No.

: 1440961-11-4; 372941-54-3 (free base)

Mol F.

: C20H19FN2O2 (base), C22H21FN2O6 (oxalate salt)

Mol W.

: 338.38,428.41(oxalatesalt)

Cat No.

: SA17007

Citalopram, Impurities

Citalopram EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 144025-14-9; 62498-67-3 (Free base)

Mol F.

: C19H20ClFN2O

Mol W.

: 346.83

Cat No.

: SA17008

Citalopram

Citalopram EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 1329745-98-3

Mol F.

: C25H33FN2O2

Mol W.

: 412.54

Cat No.

: SA17011

Citalopram, Impurities

Citalopram p-Chlorophenyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C20H21ClN2O

Mol W.

: 340.84

Cat No.

: SA17018

Citalopram, Impurities

Citalopram S-Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 219861-08-2

Mol F.

: C22H23FN2O5

Mol W.

: 414.43

Cat No.

: SA17015

Citalopram, Impurities

Citalopram USP RC E; Citalopram Related Compound E

Please enquire for price & pack size

In Stock

CAS No.

: 63284-72-0

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA17016

Clarithromycin, Impurities

Clarithromycin N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 118074-07-0

Mol F.

: C38H69NO14

Mol W.

: 763.95

Cat No.

: SA17203