[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a dipeptide formed from L-tryptophan and L-lysine residues. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=Branch1][Branch1][=C][N][Ring1][=Branch1][C][C@@H1][Branch2][Ring1][Ring1][C][=Branch1][C][=O][N][C@@H1][Branch1][=Branch1][C][C][C][C][N][C][=Branch1][C][=O][O][N]"}]