4-bromo-6-hydroxy-2-methyl-2H-pyran-3(6H)-one

2,4-dimethoxy-6-methyl-2H-pyran-5-one

2-ethoxy-4-methyl-3,7-dioxabicyclo[4.1.0]heptan-5-one

糠醇

2-methyl-3-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)oxy)-4H-pyran-4-one