英文别名2-Methyl-2-propanyl 4-chloro-7H-pyrrolo[2,3-d]pyrimidine-7-carboxylate; 7H-Pyrrolo[2,3-d]pyrimidine-7-carboxylic acid, 4-chloro-, 1,1-dimethylethyl ester; tert-butyl 4-chloropyrrolo[2,3-d]pyrimidine-7-carboxylate; tert-Butyl 4-chloro-7H-pyrrolo-[2,3-d]pyrimidine-7-carboxylate; t-Butyl 4-chloropyrrolo[2,3-d]pyrimidine-7-carboxylate; Tofacitinib Impurity 270; 7-Boc-4-chloro-7H-pyrrolo[2,3-d]pyrimidine; 4-Chloro-pyrrolo[2,3-d]pyrimidine-7-carboxylic acid t-butyl ester; 4-Chloro-7h-pyrrolo[2,3-d]pyrimidine-7-carboxylic acid 1,1-dimethylethyl ester; 4-Chloropyrrolo[2,3-d]pyrimidine-7-carboxylic acid tert-butyl ester; 4-chloro-7H-pyrrolo[2,3-d]pyrimidine-7-carboxylic acid tert-butyl ester 
