2-chloro-4-methyl-2H-furan-5-one

2-acetyl-3-hydroxy-4-methylcyclopenta-2,4-dien-1-one

二乙基(2Z)-2-甲基-2-丁烯二酸酯

(3Z)-3-[(4-methyl-5-oxo-2H-furan-2-yl)oxymethylidene]-4,6a-dihydro-3aH-cyclopenta[b]furan-2-one

8-chloro-5-hydroxy-2-methylnaphthalene-1,4-dione