[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a member of the class of bilanes that is a colourless product formed in the intestine by the reduction of bilirubin. It has a role as a human metabolite."}, {"from": "gpt", "value": "[C][C][C][=C][Branch2][=Branch1][O][C][=Branch1][C][=O][N][C][Ring1][=Branch1][C][C][=C][Branch2][Branch1][N][C][=Branch2][Ring2][P][=C][Branch1][Ring2][N][Ring1][Branch1][C][C][=C][Branch2][Ring1][=C][C][=Branch2][Ring1][=Branch2][=C][Branch1][Ring2][N][Ring1][Branch1][C][C][C][=Branch1][=N][=C][Branch1][Branch2][C][=Branch1][C][=O][N][Ring1][=Branch1][C][C][C][C][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C]"}]