[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch2][=Branch1][Ring1][C@@H1][C@H1][Branch2][Branch1][=N][C@@H1][Branch2][Branch1][Branch2][C@H1][Branch2][Branch1][Ring1][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@H1][C@@H1][Branch2][Ring2][=Branch1][C@H1][Branch2][Ring1][=N][O][C@H1][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][C@@H1][C@H1][Branch1][=C][O][C@H1][Branch1][=Branch2][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][O][O][C][O][C][=Branch1][C][=O][O][O][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is a trisaccharide consisting of a beta-D-glucose residue linked (1->3) to a beta-D-glucuronosyl residue, which is in turn linked (1->4) to a beta-D-glucose at the reducing end. Trisaccharide form of serotype 3 pneumococcal capsular polysaccharide. It has a role as an epitope."}]