4-[6-[[8-环戊基-6-(1-乙氧基乙烯基)-5-甲基-7-氧代-7,8-二氢吡啶并[2,3-d]嘧啶-2-基]氨基]吡啶-3-基]哌嗪-1-羧酸叔丁酯

4-[6-[[8-Cyclopentyl-6-(1-ethoxyvinyl)-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl]amino]pyridin-3-yl]piperazine-1-carboxylic acid tert-butyl ester