2,2,7-三甲基-2H-吡喃并[4,3-b]吡喃-5-酮

2,7-dimethyl-2,3-dihydropyrano[3,2-c]pyran-4,5-dione

6-甲基-2-氧代-2H-吡喃-4-基 乙酸酯

(5As,7s)-7-异丙烯基-3-甲基-6,7,8,9-四氢-5ah-吡喃并[4,3-b]色烯-1-酮

4-hydroxy-6-methyl-3-propanoylpyran-2-one