[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an indole and a polycyclic heteroarene. It has a role as an Escherichia coli metabolite. It is a tautomer of a 3H-indole."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=C][N][Ring1][=Branch1]"}]