[{"from": "human", "value": "Provide a description of this molecule. [C][=C][N][=C][C][=C][Ring1][=Branch1][C][=C][N][C][=Branch1][C][=O][C][=Branch1][Ring2][=C][Ring1][#Branch1][N]"}, {"from": "gpt", "value": "The molecule is a 3,4'-bipyridine substituted at positions 5 and 6 by an amino group and a keto function respectively. A pyridine phosphodiesterase 3 inhibitor, it is a drug that may improve the prognosis in patients with congestive heart failure. It has a role as an EC 3.1.4.* (phosphoric diester hydrolase) inhibitor."}]