[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][C][N][Branch2][Ring1][C][C][=N][C][=Branch1][C][=O][N][C][=Branch1][C][=O][C][Ring1][Branch2][N][Ring1][#C][C][C@@H1][Branch1][O][C@@H1][Branch1][#Branch1][C@@H1][Branch1][Ring1][C][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is riboflavin in which the double bond between positions 4a and 5 has been reduced to a single bond. It is a tautomer of a 1,5-dihydroriboflavin."}]