ruxolitinib and its Impurities
Ruxolitinib is used to treat myelofibrosis or polycythemia vera, which are bone marrow disorders that that affect your body's ability to produce blood cells. Reference standards of Ruxolitinib API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.


3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821003
CAS :
941685-39-8
Molecular Formula : C23H32N6OSi
Molecular Weight : 436.64


(R)-4-Amino-6-(1-(2-cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)pyrimidine-5-carboxylic Acid
(R)-4-Amino-6-(1-(2-cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)pyrimidine-5-carboxylic Acid
Catalogue No.:PA 18 0821005
CAS :
2606144-44-7
Molecular Formula : C16H18N6O2
Molecular Weight : 326.36


(R)-3-Cyclopentyl-3-(4-(7-nitroso-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
(R)-3-Cyclopentyl-3-(4-(7-nitroso-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821010
CAS :
NA
Molecular Formula : C17H17N7O
Molecular Weight : 335.37

![(3R)-3-(4-(7H-Pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyr PA 18 0821011](https://www.pharmaffiliates.com/pimages/PA180821011.jpg)
(3R)-3-(4-(7H-Pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)-3-(3-hydroxycyclopentyl)propanenitrile
(3R)-3-(4-(7H-Pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)-3-(3-hydroxycyclopentyl)propanenitrile
Catalogue No.:PA 18 0821011
CAS :
1809535-63-4
Molecular Formula : C17H18N6O
Molecular Weight : 322.37


(R)-3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
(R)-3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821016
CAS :
941685-40-1
Molecular Formula : C23H32N6OSi
Molecular Weight : 436.64


4-(1-Nitroso-1H-pyrazol-4-yl)-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine
4-(1-Nitroso-1H-pyrazol-4-yl)-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine
Catalogue No.:PA 18 0821019
CAS :
NA
Molecular Formula : C15H20N6O2Si
Molecular Weight : 344.45


(R)-3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile (2S,3S)-2,3-bis(benzoyloxy)succinate
(R)-3-Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile (2S,3S)-2,3-bis(benzoyloxy)succinate
Catalogue No.:PA 18 0821025
CAS :
1236033-04-7
Molecular Formula : C41H46N6O9Si
Molecular Weight : 794.94


3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821026
CAS :
1153949-38-2
Molecular Formula : C17H26BN3O2
Molecular Weight : 315.22


(S)-3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
(S)-3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PAI 18 082008
CAS :
1236033-24-1
Molecular Formula : C17H26BN3O2
Molecular Weight : 315.22


3-Cyclopentyl-3-(4-(5-(hydroxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(5-(hydroxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821027
CAS :
NA
Molecular Formula : C18H20N6O
Molecular Weight : 336.4


(R)-3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
(R)-3-Cyclopentyl-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821028
CAS :
1146629-84-6
Molecular Formula : C17H26BN3O2
Molecular Weight : 315.22


(R)-(4-(1-(2-Cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl Pivalate
(R)-(4-(1-(2-Cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl Pivalate
Catalogue No.:PA 18 0821031
CAS :
1146629-80-2
Molecular Formula : C23H28N6O2
Molecular Weight : 420.52


3-Cyclopentyl-3-(4-(6-hydroxy-5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(6-hydroxy-5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821034
CAS :
1289219-34-6
Molecular Formula : C17H18N6O2
Molecular Weight : 338.37


3-Cyclopentyl-3-(4-(5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821035
CAS :
1289218-88-7
Molecular Formula : C17H18N6O
Molecular Weight : 322.37


3-Cyclopentyl-3-(4-(5,6-dihydroxy-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
3-Cyclopentyl-3-(4-(5,6-dihydroxy-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821036
CAS :
1289219-47-1
Molecular Formula : C17H20N6O2
Molecular Weight : 340.39


(R)-3-(4-(6-Amino-5-(hydroxymethyl)pyrimidin-4-yl)-1H-pyrazol-1-yl)-3-cyclopentylpropanenitrile
(R)-3-(4-(6-Amino-5-(hydroxymethyl)pyrimidin-4-yl)-1H-pyrazol-1-yl)-3-cyclopentylpropanenitrile
Catalogue No.:PA 18 0821037
CAS :
NA
Molecular Formula : C16H20N6O
Molecular Weight : 312.38


(3R)-3-Cyclopentyl-3-(4-(6-hydroxy-5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
(3R)-3-Cyclopentyl-3-(4-(6-hydroxy-5-oxo-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821038
CAS :
3029006-62-7
Molecular Formula : C17H18N6O2
Molecular Weight : 338.37


(S)-(4-(1-(2-Cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl pivalate
(S)-(4-(1-(2-Cyano-1-cyclopentylethyl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl pivalate
Catalogue No.:PA 18 0821039
CAS :
1236033-23-0
Molecular Formula : C23H28N6O2
Molecular Weight : 420.52


(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanoic Acid
(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanoic Acid
Catalogue No.:PA 18 0821040
CAS :
NA
Molecular Formula : C19H24N6O2
Molecular Weight : 368.44


(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanamide
(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanamide
Catalogue No.:PA 18 0821041
CAS :
NA
Molecular Formula : C19H25N7O
Molecular Weight : 367.46


(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
(R)-3-Cyclopentyl-3-(5-(dimethylamino)-4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile
Catalogue No.:PA 18 0821042
CAS :
NA
Molecular Formula : C19H23N7
Molecular Weight : 349.44