[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][=Branch1][C][=O][C][=Branch1][#Branch2][=C][C@H1][Branch1][Ring2][O][Ring1][#Branch1][C][O][O]"}, {"from": "gpt", "value": "The molecule is a 3-pyranone with a 4,5-double bond carrying a hydroxy group at position 4 and a hydroxymethyl group at position 6. It is a deoxyketohexose, an anhydrohexose and a member of 3-pyrones. It is a conjugate acid of an ascopyrone M(1-)."}]