Palbociclib Impurity 42

Chemical Name: tert-butyl 4-(6-((8-cyclopentyl-5-methyl-7-oxo-6-vinyl-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate

Synonym: (3S)-tetrahydro-3-furanyl(3S,4R)-4-({[(4-aminophenyl)sulfonyl]isobutylamino}methyl)-6-[(4S,5R)-5-({[(4-aminophenyl)sulfonyl]isobutylamino}methyl)-2-oxo-4-benzyl-3-oxazolidinyl]-8,8-dihydroxy-6-oxo-3-benzyl-5,7-dioxa-2-aza-6,8-diphosphaoctanoate 8-oxide