[{"from": "human", "value": "Describe this molecule. [C][Branch2][=Branch1][Branch2][C@@H1][C@H1][Branch2][=Branch1][C][C@@H1][Branch2][Branch1][=N][C@@H1][Branch1][Ring2][O][Ring1][Branch1][O][C@H1][C@@H1][Branch2][Ring2][S][C@H1][Branch2][Ring2][#Branch2][O][C@@H1][Ring1][Branch1][O][C][C@@H1][C@H1][Branch2][Ring1][=C][C@@H1][Branch2][Ring1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][O][C][C@@H1][C@H1][Branch1][N][C@@H1][Branch1][Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][O][O][O][O][O][C][O][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is an arabinotetraose in which the four arabinofuranose residues are in a beta(1->2), alpha(1->5) and alpha(1->5) linear sequence (with alpha-configuration at the reducing end). Corresponds to part of the lipoarabinomannam from Mycobacterium leprae and M. tuberculosis. It has a role as an epitope."}]