[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a tripeptide composed of one D-alanine and two glycine residues joined in sequence. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C@H1][Branch2][Ring1][C][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O][N]"}]