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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 Propionate, Impurities

Fluticasone 17-Chlorocarbonyl Impurity

$300.00 25 mg

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CAS No.

Mol F.

: C21H25ClF2O4

Mol W.

: 414.87

Cat No.

: SA47018

Fluticasone Propionate, Impurities

Fluticasone 21-Isobutyrate Impurity

$300.00 25 mg

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CAS No.

: 1648562-63-3

Mol F.

: C26H33F3O5S

Mol W.

: 514.6

Cat No.

: SA47023

Fluticasone Propionate, Impurities

Fluticasone Acetate Chloromethyl Impurity; S-Chlorofluticasone Acetate

$300.00 25 mg

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CAS No.

: 80474-07-3

Mol F.

: C24H29ClF2O5S

Mol W.

: 503

Cat No.

: SA47025

Fluticasone Propionate, Impurities

Fluticasone Acetate Iodomethyl Impurity

$300.00 25 mg

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CAS No.

: 80474-71-1

Mol F.

: C24H29F2IO5S

Mol W.

: 594.45

Cat No.

: SA47019

Fluticasone Propionate, Impurities

Fluticasone Carbothioic Acid 17-Isobutyrate Impurity

$300.00 25 mg

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CAS No.

: 884332-14-3

Mol F.

: C26H26F2O6S

Mol W.

: 482.58

Cat No.

: SA47022

Fluticasone Propionate, Impurities

Fluticasone Dimer Impurity; Fluticasone EP Impurity G

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CAS No.

: 220589-37-7

Mol F.

: C43H51F5O8S

Mol W.

: 822.92

Cat No.

: SA47009

Fluticasone Propionate, Impurities

Fluticasone EP Impurity C; Fluticasone Acetate

$300.00 25 mg

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CAS No.

: 80474-24-4

Mol F.

: C24H29F3O5S

Mol W.

: 486.54

Cat No.

: SA47003

Fluticasone Propionate, Impurities

Fluticasone Furoate

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CAS No.

: 397864-44-7

Mol F.

: C27H29F3O6S

Mol W.

: 538.58

Cat No.

: SA47008

Fluticasone Furoate, Impurities

Fluticasone Furoate EP Impurity I

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CAS No.

: NA

Mol F.

: C27H29F3O6S

Mol W.

: 538.6

Cat No.

: SA48207

Fluticasone Propionate, Impurities

Fluticasone Furoate Impurity A

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CAS No.

: 397864-63-0

Mol F.

: C26H28F2O7

Mol W.

: 490.49

Cat No.

: SA47001

Fluticasone Furoate, Impurities

Fluticasone Furorate EP Impurity B

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CAS No.

: NA

Mol F.

: C24H29F3O5S

Mol W.

: 486.54

Cat No.

: SA47902

Fluticasone Propionate, Impurities

Fluticasone Impurity 1; Fluticasone Propionate Methyl Ester Impurity

$300.00 25 mg

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CAS No.

: 59860-80-9

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA47015

Fluticasone Propionate, Impurities

Fluticasone Propionate

$100.00 25 mg

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CAS No.

: 80474-14-2

Mol F.

: C24H30F2O6

Mol W.

: 500.57

Cat No.

: SA47000

Fluticasone Propionate, Impurities

Fluticasone Thioacid Impurity

$300.00 25 mg

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CAS No.

: 80473-92-3

Mol F.

: C21H26F2O4S

Mol W.

: 412.49

Cat No.

: SA47016

Fosaprepitant, Impurities

Fosaprepitant desfluoro impuirty

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CAS No.

Mol F.

: C23H23F6N4O6P

Mol W.

: 596.41

Cat No.

: SA45405

Fosaprepitant, Impurities

Fosaprepitant Dibenzyl Ester Impurity

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CAS No.

: 265121-01-5

Mol F.

: C37H34F7N4O6P

Mol W.

: 794.7

Cat No.

: SA45403

Fosaprepitant, Impurities

Fosaprepitant Impurity B

$350.00 25 mg

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CAS No.

: 219821-37-1

Mol F.

: C24H25F7N4O4

Mol W.

: 566.47

Cat No.

: SA45413

Fosaprepitant, Impurities

Fosaprepitant Impurity D

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CAS No.

: NA

Mol F.

: C23H22F7N4O6P

Mol W.

: 614.41

Cat No.

: SA45412

Fosaprepitant, Impurities

Fosaprepitant Monobenzyl Ester Impurity

$450.00 25 mg

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CAS No.

: 889852-02-2

Mol F.

: C30H28F7N4O6P

Mol W.

: 704.53

Cat No.

: SA45409

Fosfomycin, Impurities

Fosfomycin Cis-Propenyl Impurity

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CAS No.

: 933443-26-6

Mol F.

: C11H18NO3P

Mol W.

: 243.24

Cat No.

: SA46806

Fosfomycin, Impurities

Fosfomycin EP Impurity A (R,R)-Isomer

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CAS No.

: 132125-60-1 (acid); 1160525-87-0 (diammonium salt)

Mol F.

: C3H15N2O5P

Mol W.

: 190.14

Cat No.

: SA46801

Fosfomycin, Impurities

Fosfomycin EP Impurity C

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CAS No.

: 114252-50-5 (barium); 23001-39-0 (acid)

Mol F.

: C4H10BaNO6P

Mol W.

: 336.43

Cat No.

: SA46803

Fosfomycin, Impurities

Fosfomycin EP Impurity D

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CAS No.

: 1262243-12-8

Mol F.

: C10H25NO11P2

Mol W.

: 397.25

Cat No.

: SA46804

Fosfomycin, Impurities

Fosfomycin Trometamol

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CAS No.

: 78964-85-9 (Tromethamine Salt); 26016-99-9 (Disodium Salt); 26016-98-8 (Calcium); 23155-02-4 (Acid)

Mol F.

: C7H18NO7P

Mol W.

: 259.19

Cat No.

: SA46805

Fulvestrant, Impurities

Fulvestrant 17-Ketone

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CAS No.

: 403656-89-3

Mol F.

: C32H45F5O3S

Mol W.

: 604.75

Cat No.

: SA11812

Fulvestrant, Impurities

Fulvestrant 3-Sulfate Sodium Salt

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CAS No.

: 403656-83-7

Mol F.

: C32H46F5NaO6S2

Mol W.

: 708.82

Cat No.

: SA11811

Fulvestrant, Impurities

Fulvestrant Impurity C

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CAS No.

Mol F.

: C41H65F5O4S2

Mol W.

Cat No.

: SA11817

Fulvestrant, Impurities

Fulvestrant Impurity D Tetraacetate

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CAS No.

Mol F.

: C53H72O8

Mol W.

: 837.13

Cat No.

: SA11815

Gabapentin, Impurities

Gabapentin

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CAS No.

: 60142-96-3

Mol F.

: C9H17NO2

Mol W.

: 171.24

Cat No.

: SA22800

Gabapentin, Impurities

Gabapentin 2-Hydroxypropyl Ester

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CAS No.

: NA

Mol F.

: C₁₁H₂₁NO₃

Mol W.

: 229.32

Cat No.

: SA22808

Gabapentin, Impurities

Gabapentin Di-Nitrile

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CAS No.

: 4172-99-0

Mol F.

: C9H12N2

Mol W.

: 148.19999999999999

Cat No.

: SA22806

Gabapentin, Impurities

Gabapentin EP Impurity B; Gabapentin USP Related Compound B

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CAS No.

: 133481-09-1

Mol F.

: C9H13NO2

Mol W.

: 167.21

Cat No.

: SA22802

Gabapentin, Impurities

Gabapentin EP Impurity D; Gabapentin USP Related Compound D

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CAS No.

: 1076198-17-8

Mol F.

: C18H29NO3

Mol W.

: 307.43

Cat No.

: SA22803

Gabapentin, Impurities

Gabapentin EP Impurity E

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CAS No.

: 667465-00-1

Mol F.

: C9H14O4

Mol W.

: 186.21

Cat No.

: SA22804

Gabapentin, Impurities

Gabapentin EP Impurity G

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CAS No.

: 1500558-49-5

Mol F.

: C10H19NO2

Mol W.

: 185.26

Cat No.

: SA22805

Gabapentin, Impurities

Gabapentin Ethyl Ester

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CAS No.

: 60175-04-4

Mol F.

: C₁₁H₂₁NO₂

Mol W.

: 199.26

Cat No.

: SA22807

Gabapentin, Impurities

Gabapentin Isopropyl Amide

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CAS No.

: 1281568-83-9

Mol F.

: C₁₃H₂₃NO₃

Mol W.

: 241.33

Cat No.

: SA22813

Dapagliflozin, Impurities

galacto-Dapagliflozin

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CAS No.

: 1408245-02-2

Mol F.

: C21H25ClO6

Mol W.

: 408.873

Cat No.

: SA15042

Ganciclovir, Impurities

Ganciclovir

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CAS No.

: 82410-32-0

Mol F.

: C9H13N5O4

Mol W.

: 255.23

Cat No.

: SA13701

Ganciclovir, Impurities

Ganciclovir divalinate

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CAS No.

Mol F.

: C19H31N7O6

Mol W.

: 453.5

Cat No.

: SA13714

Ganciclovir, Impurities

Ganciclovir EP Impurity C

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CAS No.

: 108436-36-8

Mol F.

: C₉H₁₂ClN₅O₃

Mol W.

: 273.68

Cat No.

: SA13709

Ganciclovir, Impurities

Ganciclovir EP Impurity D

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CAS No.

: 1346598-14-8

Mol F.

: C10H15N5O5

Mol W.

: 285.26

Cat No.

: SA13710

Ganciclovir, Impurities

Ganciclovir EP Impurity F

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CAS No.

: 73-40-5

Mol F.

: C₅H₅N₅O

Mol W.

: 151.13

Cat No.

: SA13711

Ganciclovir, Impurities

Ganciclovir EP Impurity I

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CAS No.

: 86357-20-2

Mol F.

: C15H21N5O6

Mol W.

: 367.36

Cat No.

: SA13712

Ganciclovir, Impurities

Ganciclovir Impurity A

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CAS No.

: 1797982-93-4

Mol F.

: C₉H₁₀ClN₅O₂

Mol W.

: 255.66

Cat No.

: SA13705

Ganciclovir, Impurities

Ganciclovir Impurity B

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CAS No.

: 194159-18-7

Mol F.

: C12H17N5O5

Mol W.

: 311.29

Cat No.

: SA13707

Ganciclovir, Impurities

Ganciclovir Mono-O-acetate

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CAS No.

: 88110-89-8

Mol F.

: C₁₁H₁₅N₅O₅

Mol W.

: 297.27

Cat No.

: SA13706

Gatifloxacin, Impurities

Gatifloxacin

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CAS No.

: 112811-59-3

Mol F.

: C19H22FN3O4

Mol W.

: 375.39

Cat No.

: SA37900

Gatifloxacin, Impurities

Gatifloxacin N-Methyl Impurity

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CAS No.

: 114213-69-3

Mol F.

: C20H24FN3O4

Mol W.

: 389.42

Cat No.

: SA37906

Gemcitabine, Impurities

Gemcitabine 3-Epimer

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CAS No.

: 103882-85-5

Mol F.

: C9H11F2N3O4

Mol W.

: 263.2

Cat No.

: SA44515