PRE-CADASTRO N-Boc Vinyl Palbociclib (25 mg) (2-Methyl-2-propanyl 4-{6-[(8-cyclopentyl-5-methyl-7-oxo-6-vinyl-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl}-1-piperazinecarboxylate)