6-acetyl-8-cyclopentyl-5-methyl-2-[(5-piperazin-1-ylpyridin-2-yl)amino]pyrido[6,5-d]pyrimidin-7-one 6-acetyl-8-cyclopentyl-5-methyl-2-[(5-piperazin-1-yl-2-pyridyl)amino]pyrido[6,5-d]pyrimidin-7-one 6-acetyl-8-cyclopentyl-5-methyl-2-[[5-(1-piperazinyl)-2-pyridyl]amino]-7-pyrido[6,5-d]pyrimidinone 8-cyclopentyl-6-ethanoyl-5-methyl-2-[(5-piperazin-1-ylpyridin-2-yl)amino]pyrido[6,5-d]pyrimidin-7-one LQQ PD-332991 PD-0332991 6-ACETYL-8-CYCLOPENTYL-5-METHYL-2-[(5-PIPERAZIN-1-YLPYRIDIN-2-YL)AMINO]PYRIDO[2,3-D]PYRIMIDIN-7(8H)-ONE PD 0332991