英文别名1-Pyrrolidinecarboxylic acid, 3-(2-(((1,1-dimethylethoxy)carbonyl)(5-((4-methylphenyl)sulfonyl)-5H-pyrrolo(2,3-b)pyrazin-2-yl)amino)acetyl)-4-ethyl-, phenylmethyl ester, (3R,4S)-; 1-Pyrrolidinecarboxylic acid, 3-[2-[[(1,1-dimethylethoxy)carbonyl][5-[(4-methylphenyl)sulfonyl]-5H-pyrrolo[2,3-b]pyrazin-2-yl]amino]acetyl]-4-ethyl-, phenylmethyl ester, (3R,4S)-; Upadacitinib Impurity 4; Phenylmethyl (3R,4S)-3-[2-[[(1,1-dimethylethoxy)carbonyl][5-[(4-methylphenyl)sulfonyl]-5H-pyrrolo[2,3-b]pyrazin-2-yl]amino]acetyl]-4-ethyl-1-pyrrolidinecarboxylate; (3R,4S)-benzyl 3-(2-(tert-butoxycarbonyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)amino)acetyl)-4-ethylpyrrolidine-1-carboxylate; Upadacitinib Impurity 01; Upadacitinib Impurity 35 
