[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a Blood Viscosity Reducer. The physiologic effect of pentoxifylline is by means of Hematologic Activity Alteration."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][C][C][C][C][N][C][=Branch1][C][=O][C][=C][Branch1][#Branch1][N][=C][N][Ring1][Branch1][C][N][Branch1][Branch1][C][Ring1][O][=O][C]"}]