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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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Aceclofenac, Impurities

Aceclofenac EP Impurity E

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CAS No.

: 139272-67-6

Mol F.

: C18H17Cl2NO4

Mol W.

: 382.24

Cat No.

: SA12805

Aceclofenac, Impurities

Aceclofenac EP Impurity F

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CAS No.

: 100499-89-6

Mol F.

: C23H19Cl2NO4

Mol W.

: 444.31

Cat No.

: SA12806

Aceclofenac, Impurities

Aceclofenac EP Impurity G

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CAS No.

: 1215709-75-3

Mol F.

: C18H15Cl2NO6

Mol W.

: 412.22

Cat No.

: SA12807

Aceclofenac, Impurities

Aceclofenac EP Impurity H

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CAS No.

: 1216495-92-9

Mol F.

: C20H17Cl2NO8

Mol W.

: 470.26

Cat No.

: SA12808

Aceclofenac, Impurities

Aceclofenac EP Impurity I

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CAS No.

: 15362-40-0

Mol F.

: C14H9Cl2NO

Mol W.

: 278.13

Cat No.

: SA12809

Acemetacin, Impurities

Acemetacin

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CAS No.

: 53164-05-9

Mol F.

: C21H18ClNO6

Mol W.

: 415.8

Cat No.

: SA58900

Acemetacin, Impurities

Acemetacin EP Impurity A

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CAS No.

: 74-11-3

Mol F.

: C7H5ClO2

Mol W.

: 156.6

Cat No.

: SA58901

Acemetacin, Impurities

Acemetacin EP Impurity B

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CAS No.

: 53-86-1

Mol F.

: C19H16ClNO4

Mol W.

: 357.8

Cat No.

: SA58902

Acetaminophen, Impurities

Acetaminophen EP Impurity A

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CAS No.

: 614-80-2

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA37001

Acetaminophen, Impurities

Acetaminophen EP Impurity B

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CAS No.

: 1693-37-4

Mol F.

: C9H11NO2

Mol W.

: 165.19

Cat No.

: SA37002

Acetaminophen, Impurities

Acetaminophen EP Impurity C

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CAS No.

: 3964-54-3

Mol F.

: C8H8ClNO2

Mol W.

: 185.61

Cat No.

: SA37003

Acetaminophen, Impurities

Acetaminophen EP Impurity D

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CAS No.

: 103-84-4

Mol F.

: C8H9NO

Mol W.

: 135.16

Cat No.

: SA37004

Acetaminophen, Impurities

Acetaminophen EP Impurity E

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CAS No.

: 99-93-4

Mol F.

: C8H8O2

Mol W.

: 136.15

Cat No.

: SA37005

Acetaminophen, Impurities

Acetaminophen EP Impurity F

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CAS No.

: 100-02-7

Mol F.

: C6H5NO3

Mol W.

: 139.11

Cat No.

: SA37006

Acetaminophen, Impurities

Acetaminophen EP Impurity G

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CAS No.

: 34523-34-7

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA37007

Acetaminophen, Impurities

Acetaminophen EP Impurity H

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CAS No.

: 2623-33-8

Mol F.

: C10H11NO3

Mol W.

: 193.2

Cat No.

: SA37008

Acetaminophen, Impurities

Acetaminophen EP Impurity I

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CAS No.

: 118-93-4

Mol F.

: C8H8O2

Mol W.

: 136.15

Cat No.

: SA37009

Acetaminophen, Impurities

Acetaminophen EP Impurity J

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CAS No.

: 539-03-7

Mol F.

: C8H8ClNO

Mol W.

: 169.61

Cat No.

: SA37010

Acetaminophen, Impurities

Acetaminophen EP Impurity K

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CAS No.

: 51-78-5;123-30-8

Mol F.

: C6H7NO

Mol W.

: 109.13

Cat No.

: SA37011

Acetaminophen, Impurities

Acetaminophen EP Impurity L

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CAS No.

: NA

Mol F.

: C16H16N2O4

Mol W.

: 300.31

Cat No.

: SA37012

Aciclovir, Impurities

Acetyl 2-[(2-Formamide-1,6-dihydro-6-chloro-9H-purin-9yl)methoxy]ethyl Ester

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CAS No.

: 1346598-89-7

Mol F.

: C11H12ClN5O4

Mol W.

: 316.7

Cat No.

: SA21428

Acetylcysteine, Impurities

Acetylcysteine

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CAS No.

: 616-91-1

Mol F.

: C5H9NO3S

Mol W.

: 163.2

Cat No.

: SA54300

Acetylcysteine, Impurities

Acetylcysteine EP Impurity A

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CAS No.

: 56-89-3

Mol F.

: C6H12N2O4S2

Mol W.

: 240.3

Cat No.

: SA54301

Acetylcysteine, Impurities

Acetylcysteine EP Impurity B

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CAS No.

: 52-89-1

Mol F.

: C3H7NO2S : HCl

Mol W.

: 121.2 : 36.5

Cat No.

: SA54302

Acetylcysteine, Impurities

Acetylcysteine EP Impurity C

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CAS No.

: 5545-17-5

Mol F.

: C10H16N2O6S2

Mol W.

: 324.4

Cat No.

: SA54303

Acetylcysteine, Impurities

Acetylcysteine EP Impurity D

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CAS No.

: 18725-37-6

Mol F.

: C7H11NO4S

Mol W.

: 205.2

Cat No.

: SA54304

Aciclovir, Impurities

Aciclovir

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CAS No.

: 59277-89-3

Mol F.

: C8H11N5O3

Mol W.

: 225.2

Cat No.

: SA21401

Aciclovir, Impurities

Aciclovir Acid

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CAS No.

: 80685-22-9

Mol F.

: C8H9N5O4

Mol W.

: 239.19

Cat No.

: SA21430

Aciclovir, Impurities

Aciclovir EP Impurity I

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CAS No.

: 1797832-75-7

Mol F.

: C14H16N10O4

Mol W.

: 388.34

Cat No.

: SA21415

Aciclovir, Impurities

Aciclovir EP Impurity Q

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CAS No.

: NA

Mol F.

: C9H13N5O4

Mol W.

: 255.24

Cat No.

: SA21414

Aciclovir, Impurities

Aciclovir EP Impurity R

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CAS No.

: NA

Mol F.

: C17H22N10O6

Mol W.

: 462.42

Cat No.

: SA21419

Aciclovir, Impurities

Aciclovir Monophosphate

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CAS No.

: 66341-16-0

Mol F.

: C8H12N5O6P

Mol W.

: 305.18

Cat No.

: SA21421

Aciclovir, Impurities

Aciclovir N-Methyl-L-valinate Hydrochloride

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CAS No.

: 1346617-39-7

Mol F.

: C14H23ClN6O4

Mol W.

: 374.82

Cat No.

: SA21420

Oxcarbazepine

Acridine

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CAS No.

: 260-94-6

Mol F.

: C13H9N

Mol W.

: 179.22

Cat No.

: SA12508

Oxcarbazepine

Acridine Carboxylic Acid Hydrate

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CAS No.

: 332927-03-4

Mol F.

: C15H9NO2

Mol W.

: 233.23

Cat No.

: SA12502

Acrivastine, Impurities

Acrivastine

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CAS No.

: 87848-99-5

Mol F.

: C22H24N2O2

Mol W.

: 348.44

Cat No.

: SA58800

Acrivastine, Impurities

Acrivastine Z-Isomer

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CAS No.

: 1057138-89-2

Mol F.

: C22H24N2O2

Mol W.

: 348.44

Cat No.

: SA58801

Adapalene, Impurities

Adapalene

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CAS No.

: 106685-40-9

Mol F.

: C28H28O3

Mol W.

: 412.5

Cat No.

: SA55100

Adapalene, Impurities

Adapalene EP Impurity A

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CAS No.

: 932033-58-4

Mol F.

: C22H14O4

Mol W.

: 342.3

Cat No.

: SA55101

Adapalene, Impurities

Adapalene EP Impurity B

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CAS No.

: 1346599-76-5

Mol F.

: C28H28O4

Mol W.

: 428.5

Cat No.

: SA55102

Adapalene, Impurities

Adapalene EP Impurity C

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CAS No.

: 43109-77-9

Mol F.

: C17H22O

Mol W.

: 242.4

Cat No.

: SA55103

Adapalene, Impurities

Adapalene EP Impurity D

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CAS No.

: 932033-57-3

Mol F.

: C34H42O2

Mol W.

: 482.7

Cat No.

: SA55104

Adapalene, Impurities

Adapalene Methyl Ester

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CAS No.

: 106685-41-0

Mol F.

: C29H30O3

Mol W.

: 426.5

Cat No.

: SA55105

Adapalene, Impurities

Adapalene USP Related Compound A

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CAS No.

: 33626-98-1

Mol F.

: C12H9BrO2

Mol W.

: 265.1

Cat No.

: SA55106

Adrenaline, Impurities

Adrenaline

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CAS No.

: 51-43-4

Mol F.

: C9H13NO3

Mol W.

: 183.2

Cat No.

: SA57900

Adrenaline, Impurities

Adrenaline EP Impurity B

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CAS No.

: 51-41-2

Mol F.

: C8H11NO3

Mol W.

: 169.18

Cat No.

: SA57901

Adrenaline, Impurities

Adrenaline EP Impurity C

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CAS No.

: 99-45-6

Mol F.

: C9H11NO3

Mol W.

: 181.19

Cat No.

: SA57904

Adrenaline, Impurities

Adrenaline EP Impurity D

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CAS No.

: 317351-40-9

Mol F.

: C16H19NO3

Mol W.

: 273.33

Cat No.

: SA57902

Adrenaline, Impurities

Adrenaline EP Impurity E

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CAS No.

: 36467-25-1

Mol F.

: C16H17NO3

Mol W.

: 271.31

Cat No.

: SA57903

Afatinib, Impurities

Afatinib 3,4-Dichlorophenyl Impurity

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CAS No.

: 2512206-82-3

Mol F.

: C14H7Cl2FN4O2

Mol W.

: 353.14

Cat No.

: SA58004