Tofacitinib Impurity 163

(E) -tert-butyl 3-amino-2-cyano-5- ((3S,4R) -4-methyl-3- (methyl (7H-pyrrolo[2,3-d]pyrimidin-4-yl) amino) piperidin-1-yl) -5-oxopent-2-enoate

C23H31N7O3

453.54

Tofacitinib

(E) -tert-butyl 3-amino-2-cyano-5- ((3S,4R) -4-methyl-3- (methyl (7H-pyrrolo[2,3-d]pyrimidin-4-yl) amino) piperidin-1-yl) -5-oxopent-2-enoate