[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch1][Ring2][C][C][N][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C@@H1][C@@H1][Branch1][S][C@@H1][Branch1][N][C@H1][Branch1][Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is an L-lysine derivative arising from amide formation between N-2 of L-lysine and the carboxy group of alpha-D-galactopyranuronic acid. It has a role as an epitope."}]