[{"from": "human", "value": "Could you provide a description of this molecule? [C][Branch1][#Branch2][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][S][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is the meso-isomer of lanthionine. It is a key constituent of bacterial peptidoglycan type A51 and A3delta. It is a lanthionine, a L-cysteine derivative and a D-cysteine derivative."}]