Tofacitinib Impurity R

Chemical Name: 7H-​Pyrrolo[2,​3-​d]​pyrimidine, 4-​chloro-​7-​[(4-​methylphenyl)​sulfonyl]​-; 4-Chloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidine 4-Chloro-7-(4-methylphenylsulfonyl)-7H-pyrrolo[2,3-d]pyrimidine 4-Chloro-7-tosyl-7H-pyrrolo[2,3-d]pyrimidine