强效,高度特异性的Cdk4 / Cdk6 \ xa0抑制剂;Potent, highly specific Cdk4/Cdk6\xa0inhibitor;Palbociclib (PD-0332991) is an orally available pyridopyrimidine-derived cyclin-dependent kinase (CDK) inhibitor with potential antineoplastic activity.;Palbociclib (PD-0332991) is an orally available pyridopyrimidine-derived cyclin-dependent kinase (CDK) inhibitor with potential antineoplastic activity.