Palbociclib Impurity 40

Chemical Name: 1-(6-((6-acetyl-8-cyclopentyl-5-methyl-7-oxo-4a,7,8,8a-tetrahydropyrido[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-2,3-dione

Synonym: ((hydroxyphosphoryl)bis(carbonyl))bis(((2R,3S)-2-(((4-amino-N-isobutylphenyl)sulfonamido)methyl)-4-phenyl-3-(((((S)-tetrahydrofuran-3-yl)oxy)carbonyl)amino)butanoyl)phosphinic acid)