英文别名Palbociclib Impurity 4; Palbociclib Impurity E; 8-cyclopentyl-6-(1-hydroxyethyl)-5-methyl-2-[(5-piperazin-1-ylpyridin-2-yl)amino]pyrido[2,3-d]pyrimidin-7-one; Palbociclib Impurity 22; Pyrido[2,3-d]pyrimidin-7(8H)-one, 8-cyclopentyl-6-(1-hydroxyethyl)-5-methyl-2-[[5-(1-piperazinyl)-2-pyridinyl]amino]-; Palbociclib Impurity 40