[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=C][Branch2][Ring2][#C][C][=Branch1][C][=O][N][Branch2][Ring1][S][C][=N][C][=Branch1][Branch2][=N][C][=C][Ring1][O][Ring1][=Branch1][N][C][=N][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][C][N][C][C][Ring1][=Branch1][C][C][C][C][C][Ring1][Branch1][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a member of the class of pyridopyrimidines that is 2-{[5-(piperazin-1-yl)pyridin-2-yl]amino}pyrido[2,3-d]pyrimidin-7-one bearing additional methyl, acetyl and cyclopentyl substituents at positions 5, 6 and 8 respectively. It is used in combination with letrozole for the treatment of metastatic breast cancer. It has a role as an EC 2.7.11.22 (cyclin-dependent kinase) inhibitor and an antineoplastic agent. It is a pyridopyrimidine, an aminopyridine, a secondary amino compound, a member of piperidines, an aromatic ketone, a member of cyclopentanes and a tertiary amino compound."}]