Tofacitinib Impurity B

Chemical Name: (3S,4R)- 4-Methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-1-piperidinepropanenitrile; 2-Isocyano-1-((3S,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)ethanone

Synonym: R-(+)-Lansoprazole