The molecule is a 4-pyranone with a 2,3-double bond carrying a hydroxy group at position 3 and a hydroxymethyl group at position 6. It is a deoxyketohexose and an anhydrohexose. It is a conjugate acid of an ascopyrone P(1-).
(2S)-5-hydroxy-2-(hydroxymethyl)-2,3-dihydropyran-4-one