(1R,5S,6S,7S)-(+)-6-acetoxymethyl-7-hydroxy-2-oxabicyclo[3.3.0]octan-3-one

((3aR,4S,6aS)-5-乙酰氧基-2-氧代六氢-2H-环戊并[b]呋喃-4-基)甲基 乙酸酯

((3aS,4R,5S,6aR)-5-acetoxy-2-oxohexahydro-2H-cyclopenta[b]furan-4-yl)methyl acetate