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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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Atomoxetine, Impurities

Atomoxetine HCl Racemate

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CAS No.

: 82857-40-7

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22113

Atomoxetine, Impurities

Atomoxetine m-Methyl Racemate

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CAS No.

: 873310-29-3 (FreeBase)

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA22114

Atomoxetine, Impurities

Atomoxetine N-Desmethyl Impurity

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CAS No.

: 881995-46-6

Mol F.

: C16H20ClNO

Mol W.

: 277.79

Cat No.

: SA22115

Atomoxetine, Impurities

Atomoxetine USP Related Compound C

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CAS No.

: 56161-78-5

Mol F.

: C17H21NO

Mol W.

: 255.4

Cat No.

: SA22124

Atorvastatin, Impurities

Atorvastatin (3S,5R)-Isomer Methyl Ester

$500.00 50 mg

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CAS No.

: 1429437-85-3

Mol F.

: C34H37FN2O5

Mol W.

: 572.67

Cat No.

: SA17819

Atorvastatin, Impurities

Atorvastatin 2-Hydroxy

$2,500.00 100 mg

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CAS No.

: 214217-86-4 (acid); 265989-46-6 (Salt)

Mol F.

: C33H35FN2O6

Mol W.

: 574.64

Cat No.

: SA17821

Atorvastatin, Impurities

Atorvastatin 3-Oxo Acid

$2,100.00 100 mg

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CAS No.

: 1391052-00-8 (Salt)

Mol F.

: C33H33FN2O5

Mol W.

: 556.62

Cat No.

: SA17822

Atorvastatin, Impurities

Atorvastatin 3-Oxopropyl Impurity

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CAS No.

: 110862-46-9

Mol F.

: C29H27FN2O2

Mol W.

: 454.54

Cat No.

: SA17823

Atorvastatin

Atorvastatin Diamino Impurity

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CAS No.

: 1116118-82-1

Mol F.

: C50H64FN3O8

Mol W.

: 854.06

Cat No.

: SA17849

Atorvastatin, Impurities

Atorvastatin EP Impurity B

$450.00 25 mg

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CAS No.

: 842103-12-2

Mol F.

: C33H35N2O5

Mol W.

: 558.64

Cat No.

: SA17810

Atorvastatin, Impurities

Atorvastatin EP Impurity D

$450.00 25 mg

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CAS No.

: 148146-51-4

Mol F.

: C26H22FNO4

Mol W.

: 431.46

Cat No.

: SA17812

Atorvastatin, Impurities

Atorvastatin EP Impurity Q

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CAS No.

: 906552-18-9

Mol F.

: C33H35FN2O6

Mol W.

: 574.6

Cat No.

: SA17850

Atorvastatin, Impurities

Atorvastatin Epoxy Pyrrolooxazin 6-Hydroxy Analog

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CAS No.

: 873950-17-5

Mol F.

: C33H35FN2O7

Mol W.

: 590.64

Cat No.

: SA17851

Atorvastatin, Impurities

Atorvastatin Epoxy Pyrrolooxazin 7-Hydroxy Analog

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CAS No.

: 873950-18-6

Mol F.

: C33H35FN2O7

Mol W.

: 590.64

Cat No.

: SA17852

Atovaquone, Impurities

Atovaquone

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CAS No.

: 95233-18-4

Mol F.

: C22H19ClO3

Mol W.

: 366.8

Cat No.

: SA55000

Atovaquone, Impurities

Atovaquone EP Impurity A

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CAS No.

: 2517583-91-2

Mol F.

: C22H19ClO3

Mol W.

: 366.8

Cat No.

: SA55001

Atovaquone, Impurities

Atovaquone EP Impurity B

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CAS No.

: 137732-39-9

Mol F.

: C22H19ClO3

Mol W.

: 366.8

Cat No.

: SA55002

Atovaquone, Impurities

Atovaquone EP Impurity C

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CAS No.

: 1809464-27-4

Mol F.

: C22H17ClO3

Mol W.

: 364.8

Cat No.

: SA55003

Atovaquone, Impurities

Atovaquone EP Impurity D

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CAS No.

: 129700-41-0

Mol F.

: C23H21ClO3

Mol W.

: 380.9

Cat No.

: SA55004

Atropine, Impurities

Atropine

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CAS No.

: 51-55-8

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA47700

Atropine, Impurities

Atropine EP Impurity C

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CAS No.

: 552-63-6

Mol F.

: C9H10O3

Mol W.

: 166.17

Cat No.

: SA47703

Atropine, Impurities

Atropine EP Impurity D

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CAS No.

: 55869-99-3; 55449-49-5 (HBr)

Mol F.

: C17H23NO4

Mol W.

: 305.37

Cat No.

: SA47704

Atropine, Impurities

Atropine EP Impurity E

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CAS No.

: 949092-65-3

Mol F.

: C17H23NO4

Mol W.

: 305.37

Cat No.

: SA47705

Atropine, Impurities

Atropine EP Impurity F (HBr Trihydrate)

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CAS No.

: 6533-68-2

Mol F.

: C17H28BrNO7

Mol W.

: 438.31

Cat No.

: SA47706

Atropine, Impurities

Atropine EP Impurity G

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CAS No.

: 21956-47-8 (Base)

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA47707

Avatrombopag, Impurities

Avatrombopag 5-Chloro Acid Impurity

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CAS No.

: NA

Mol F.

: C29H34Cl2N6O3S2

Mol W.

: 649.70000000000005

Cat No.

: SA43906

Avatrombopag, Impurities

Avatrombopag Bromo Acid Impurity

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CAS No.

: NA

Mol F.

: C29H33BrCl2N6O3S2

Mol W.

: 728.5

Cat No.

: SA43903

Avatrombopag, Impurities

Avatrombopag Di Acid Impurity

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CAS No.

: 958457-83-5

Mol F.

: C12H13ClN2O4

Mol W.

: 284.7

Cat No.

: SA43902

Avatrombopag, Impurities

Avatrombopag Diamide Impurity

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CAS No.

: NA

Mol F.

: C46H55Cl3N10O2S4

Mol W.

: 1014.6

Cat No.

: SA43905

Avatrombopag, Impurities

Avatrombopag Ester Impurity

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CAS No.

Mol F.

: C31H38Cl2N6O3S2 : C3H7NO

Mol W.

: 677.7: 73.1

Cat No.

: SA43904

Avatrombopag, Impurities

Avatrombopag Maleate

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CAS No.

: 677007-74-8

Mol F.

: C29H34Cl2N6O3S2 : C4H4O4

Mol W.

: 649.7 116.1

Cat No.

: SA43901

Avatrombopag, Impurities, Nitrosamine

Avatrombopag N-nitrosopiperazinyl Impurity

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CAS No.

: NA

Mol F.

: C23H23Cl2N7O4S2

Mol W.

: 596.5

Cat No.

: SA43907

Avibactam, Impurities

Avibactam

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CAS No.

: 1192500-31-4

Mol F.

: C7H11N3O6S

Mol W.

: 265.2

Cat No.

: SA57600

Avibactam, Impurities

Avibactam Enantiomer

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CAS No.

: 1383913-01-6

Mol F.

: C7H10N3O6S

Mol W.

: 264.2

Cat No.

: SA57605

Avibactam, Impurities

Avibactam Ethyl Ester

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CAS No.

: NA

Mol F.

: C9H14N2O7S

Mol W.

: 294.3

Cat No.

: SA57603

Axitinib, Impurities

Axitinib Asymmetric Dimer Impurity | CAS : 1428728-84-0

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CAS No.

: 1428728-84-0

Mol F.

: C44H36N8O2S2

Mol W.

: 773.0

Cat No.

: SA52216

Axitinib, Impurities

Axitinib Cyclobutane Dimer Impurity | CAS : 1428728-83-9

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CAS No.

: 1428728-83-9

Mol F.

: C44H36N8O2S2

Mol W.

: 773.0

Cat No.

: SA52217

Axitinib, Impurities

Axitinib Impurity A | CAS : 319472-78-1

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CAS No.

: 319472-78-1

Mol F.

: C7H4I2N2

Mol W.

: 369.93

Cat No.

: SA52202

Azacitidine, Impurities

Azacitidine

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CAS No.

: 320-67-2

Mol F.

: C₈H₁₂N₄O₅

Mol W.

: 244.2

Cat No.

: SA37500

Azacitidine, Impurities

Azacitidine Dicarbamide Impurity

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CAS No.

: 108-19-0

Mol F.

: C2H5N3O2

Mol W.

: 103.08

Cat No.

: SA37508

Azacitidine, Impurities

Azacitidine Formyl Amidine Analog

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CAS No.

: 65126-88-7

Mol F.

: C8H14N4O6

Mol W.

: 262.22

Cat No.

: SA37504

Azacitidine, Impurities

Azacitidine Related Compound C Isomer-4

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CAS No.

: 1698011-17-4

Mol F.

: C7H14N4O5

Mol W.

: 234.2

Cat No.

: SA37510

Azathioprine, Impurities

Azathioprine

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CAS No.

: 446-86-6

Mol F.

: C9H7N7O2S

Mol W.

: 277.26

Cat No.

: SA17900

Azathioprine, Impurities

Azathioprine EP Impurity C

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CAS No.

: 4897-25-0

Mol F.

: C4H4ClN3O2

Mol W.

: 161.55

Cat No.

: SA17904

Azathioprine, Impurities

Azathioprine EP Impurity D

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CAS No.

: 6339-54-4

Mol F.

: C₄H₅N₃O₂S

Mol W.

: 159.17

Cat No.

: SA17905

Azathioprine, Impurities

Azathioprine EP Impurity E

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CAS No.

: 73703-74-9 (free base); 35681-68-6(sodium salt)

Mol F.

: C4H4N3NaO3

Mol W.

: 165.08

Cat No.

: SA17906

Azathioprine, Impurities

Azathioprine EP Impurity F

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CAS No.

: 68-94-0

Mol F.

: C5H4N4O

Mol W.

: 136.11

Cat No.

: SA17907

Azathioprine, Impurities

Azathioprine Purinylthio Purine Impurity

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CAS No.

: NA

Mol F.

: C10H6N8S

Mol W.

: 270.27

Cat No.

: SA17909

Azelastine, Impurities

Azelastine

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CAS No.

: 58581-89-8

Mol F.

: C22H24ClN3O

Mol W.

: 381.9

Cat No.

: SA54700

Azelastine, Impurities

Azelastine EP Impurity A

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CAS No.

: 613-94-5

Mol F.

: C7H8N2O

Mol W.

: 136.2

Cat No.

: SA54703