[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a Phosphodiesterase 5 Inhibitor. The mechanism of action of sildenafil is as a Phosphodiesterase 5 Inhibitor."}, {"from": "gpt", "value": "[C][C][C][C][=N][N][Branch2][Ring2][S][C][=C][Ring1][Branch1][N][=C][Branch1][=Branch1][N][C][Ring1][=Branch1][=O][C][=C][Branch2][Ring1][O][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][S][=Branch1][C][=O][=Branch1][C][=O][N][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][O][C][C][C]"}]