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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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Fluticasone Furoate, Impurities

Fluticasone 11-Keto Impurity

$250.00 25 mg

In Stock

CAS No.

: 397864-56-1

Mol F.

: C27H27F3O6S

Mol W.

: 536.56

Cat No.

: SA48215

Fluticasone Propionate, Impurities

Fluticasone Carbothioic Acid Impurity

$300.00 25 mg

In Stock

CAS No.

: 80474-45-9

Mol F.

: C24H30F2O5S

Mol W.

: 468.55

Cat No.

: SA47020

Fluticasone Propionate, Impurities

Fluticasone Carboxylic Acid Impurity; Fluticasone USP Related Compound J

$300.00 25 mg

In Stock

CAS No.

: 28416-82-2

Mol F.

: C21H26F2O5

Mol W.

: 396.42

Cat No.

: SA47017

Fluticasone Furoate, Impurities

Fluticasone Dimer Impurity

$1,600.00 25 mg

In Stock

CAS No.

: 220589-37-7

Mol F.

: C43H51F5O8S

Mol W.

: 822.93

Cat No.

: SA48209

Fluticasone Propionate, Impurities

Fluticasone EP Impurity A

$300.00 25 mg

In Stock

CAS No.

: 65429-42-7

Mol F.

: C25H31F3O5S

Mol W.

: 452.49

Cat No.

: SA47012

Fluticasone Propionate, Impurities

Fluticasone EP Impurity D; Ticabesone Propionate

$300.00 25 mg

In Stock

CAS No.

: 73205-13-7

Mol F.

: C25H32F2O5S

Mol W.

: 482.58

Cat No.

: SA47004

Fluticasone Propionate, Impurities

Fluticasone EP Impurity H; Fluticasone Propionate EP Impurity H

$300.00 25 mg

In Stock

CAS No.

: 201812-64-8

Mol F.

: C48H58F4O10S2

Mol W.

: 935.09

Cat No.

: SA47010

Fluticasone Propionate, Impurities

Fluticasone EP Impurity I; Fluticasone PropionateEP Impurity I

$300.00 25 mg

In Stock

CAS No.

: 960071-64-1

Mol F.

: C48H58F4O10S3

Mol W.

: 967.2

Cat No.

: SA47011

Fluticasone Propionate, Impurities

Fluticasone EP Impurity K

$1,000.00 25 mg

In Stock

CAS No.

Mol F.

: C25H31ClF2O5S

Mol W.

: 517

Cat No.

: SA47028

Fluticasone Furoate, Impurities

Fluticasone Furoate

Please enquire for price & pack size

In Stock

CAS No.

: 397864-44-7

Mol F.

: C27H29F3O6S

Mol W.

: 538.58

Cat No.

: SA48200

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 397864-63-0

Mol F.

: C26H28F2O7

Mol W.

: 490.49

Cat No.

: SA48201

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 80474-24-4

Mol F.

: C24H29F3O5S

Mol W.

: 486.5

Cat No.

: SA48202

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 398454-97-2

Mol F.

: C27H30F2O6S

Mol W.

: 520.6

Cat No.

: SA48203

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C29H34F2O7

Mol W.

: 532.6

Cat No.

: SA48204

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 785806-96-4

Mol F.

: C27H29ClF2O6S

Mol W.

: 555

Cat No.

: SA48205

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity H

$1,000.00 25 mg

In Stock

CAS No.

Mol F.

: C27H29ClF2O6S

Mol W.

: 555

Cat No.

: SA48206

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity J

$250.00 25 mg

In Stock

CAS No.

Mol F.

: C27H28ClF3O6S

Mol W.

: 573

Cat No.

: SA48208

Fluticasone Furoate, Impurities

Fluticasone O- Fluoro methyl ester

$250.00 25 mg

In Stock

CAS No.

: 572880-17-3

Mol F.

: C27H29F3O7

Mol W.

: 522.51

Cat No.

: SA48214

Fluticasone Propionate, Impurities

Fluticasone Propionate EP Impurity B; Fluticasone EP Impurity B

$350.00 25 mg

In Stock

CAS No.

: 948566-12-9

Mol F.

: C24H30F2O6S

Mol W.

: 484.55

Cat No.

: SA47002

Fluticasone Propionate, Impurities

Fluticasone Propionate EP Impurity E

$300.00 25 mg

In Stock

CAS No.

: 105613-90-9

Mol F.

: C25H33F3O5S

Mol W.

: 502.59

Cat No.

: SA47006

Fluticasone Propionate, Impurities

Fluticasone Propionate EP Impurity F

$300.00 25 mg

In Stock

CAS No.

: 1219174-94-3

Mol F.

: C25H29F3O5S

Mol W.

: 498.55

Cat No.

: SA47007

Fluticasone Propionate, Impurities

Fluticasone Propionate Fluoromethyl Ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1174034-79-7

Mol F.

: C25H31F3O6

Mol W.

: 484.51

Cat No.

: SA47026

Fluticasone Propionate, Impurities

Fluticasone Propionate Iodomethyl Impurity

$300.00 25 mg

In Stock

CAS No.

: 80474-67-5

Mol F.

: C25H31F2IO5S

Mol W.

: 608.48

Cat No.

: SA47014

Fluticasone Propionate, Impurities

Fluticasone USP Related Compound B

$300.00 25 mg

In Stock

CAS No.

: 219719-95-6

Mol F.

: C22H24F2O5S

Mol W.

: 438.48

Cat No.

: SA47027

Aminocaproic Acid, Impurities

Fmoc-6-aminohexanoic acid

Please enquire for price & pack size

In Stock

CAS No.

: 88574-06-5

Mol F.

: C₂₁H₂₃NO₄

Mol W.

: 353.41

Cat No.

: SA22604

Formoterol, Impurities

Formoterol Dimer (n-1) Intermediate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C65H70N4O6

Mol W.

: 1003.27

Cat No.

: SA21111

Formoterol, Impurities

Formoterol Fumarate EP Impurity F

$1,100.00 25 mg

In Stock

CAS No.

: 1795129-59-7

Mol F.

: C37H46N4O6

Mol W.

: 642.8

Cat No.

: SA21106

Formoterol, Impurities

Formoterol Fumarate Impurity A

$350.00 25 mg

In Stock

CAS No.

: 150513-24-9

Mol F.

: C18H24N2O3

Mol W.

: 316.39

Cat No.

: SA21101

Formoterol, Impurities

Formoterol Fumarate Impurity B

$350.00 25 mg

In Stock

CAS No.

: 1224588-66-2

Mol F.

: C18H22N2O4

Mol W.

: 330.38

Cat No.

: SA21102

Formoterol, Impurities

Formoterol Fumarate Impurity C

$300.00 25 mg

In Stock

CAS No.

: 1795135-61-3

Mol F.

: C₂₀H₂₆N₂O₄

Mol W.

: 358.43,

Cat No.

: SA21103

Formoterol, Impurities

Formoterol Fumarate Impurity D

$200.00 25 mg

In Stock

CAS No.

: 1795133-96-8

Mol F.

: C20H26N2O4

Mol W.

: 358.44

Cat No.

: SA21104

Formoterol, Impurities

Formoterol Fumarate Impurity E

$600.00 25 mg

In Stock

CAS No.

: 1616967-26-0

Mol F.

: C20H26N2O4

Mol W.

: 358.43

Cat No.

: SA21105

Formoterol, Impurities

Formoterol Fumarate Impurity G

$150.00 25 mg

In Stock

CAS No.

: 64-13-1

Mol F.

: C10H15NO

Mol W.

: 165.23

Cat No.

: SA21107

Formoterol, Impurities

Formoterol Fumarate Impurity H

$300.00 25 mg

In Stock

CAS No.

: 1337876-26-2

Mol F.

: C26H30N2O4

Mol W.

: 434.54

Cat No.

: SA21108

Formoterol, Impurities

Formoterol Fumarate Impurity I

$600.00 25 mg

In Stock

CAS No.

: 532414-36-1

Mol F.

: C19H24N2O4

Mol W.

: 344.41

Cat No.

: SA21109

Fosaprepitant

Fosaprepitant (Morpholine Nitroso Intermediate)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C20H17F7N2O3

Mol W.

: 466.35

Cat No.

: SA45428

Fosaprepitant, Impurities

Fosaprepitant Diastereomer impurity

$850.00 25 mg

In Stock

CAS No.

: 1523569-90-5

Mol F.

: C23H22F7N4O6P.2C7H17NO5

Mol W.

: 1004.83

Cat No.

: SA45406

Fosaprepitant

Fosaprepitant Dibenzyl Phosphate Ester Impurity

$250.00 25 mg

PLEASE ENQUIRE

CAS No.

: 265121-01-5

Mol F.

: C37H34F7N4O6P

Mol W.

: 794.65

Cat No.

: SA45407

Fosaprepitant, Impurities

Fosaprepitant Dimeglumine impurity F

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C44H62F7N6O16P

Mol W.

: 1094.96 (Dimeglumine salt); 704.53 (Free Base)

Cat No.

: SA45427

Fosaprepitant, Impurities

Fosaprepitant Enantiomer

$750.00 25 mg

In Stock

CAS No.

: 1523569-86-9; 1523569-87-0 [Salt]

Mol F.

: C37H56F7N6O16P

Mol W.

: 1004.83●614.41 (Free base)

Cat No.

: SA45418

Fosaprepitant, Impurities

Fosaprepitant Ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1803189-49-2

Mol F.

: C24H25F7N4O4

Mol W.

: 566.47

Cat No.

: SA45404

Fosaprepitant, Impurities

Fosaprepitant Impurity A

$450.00 25 mg

In Stock

CAS No.

: 170902-81-5

Mol F.

: C23H21F7N4O3

Mol W.

: 534.43

Cat No.

: SA45410

Fosaprepitant, Impurities

Fosaprepitant Impurity C

$100.00 25 mg

In Stock

CAS No.

: 170729-80-3

Mol F.

: C23H21F7N4O3

Mol W.

: 534.43

Cat No.

: SA45411

Fosfomycin, Impurities

Fosfomycin EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 84954-80-3 (acid)

Mol F.

: C3H15N2O5P

Mol W.

: 190.14

Cat No.

: SA46800

Fosfomycin, Impurities

Fosfomycin EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 1262243-11-7

Mol F.

: C7H18NO7P

Mol W.

: 259.19

Cat No.

: SA46802

Fulvestrant, Impurities

Fulvestrant

$200.00 25 mg

In Stock

CAS No.

: 129453-61-8

Mol F.

: C32H47F5O3S

Mol W.

: 606.77

Cat No.

: SA11810

Fulvestrant, Impurities

Fulvestrant 9-Sulfone

$250.00 25 mg

In Stock

CAS No.

: 98008-06-1

Mol F.

: C32H47F5O4S

Mol W.

: 622.77

Cat No.

: SA11805

Fulvestrant, Impurities

Fulvestrant Extended

$1,100.00 25 mg

In Stock

CAS No.

Mol F.

: C41H65F5O4S2

Mol W.

: 781.07

Cat No.

: SA11804

Fulvestrant, Impurities

Fulvestrant Impurity – 12 (17-alpha isomer)

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C29H43BrO3

Mol W.

: 519.55

Cat No.

: SA11822

Fulvestrant, Impurities

Fulvestrant Impurity 6

Please enquire for price & pack size

In Stock

CAS No.

: 741246-55-9

Mol F.

: C10H23BrN2OS

Mol W.

: 299.27 (HBr salt); 218.36 (Free base)

Cat No.

: SA11820