5-bromo-5-(chloromethyl)-3-methylfuran-2-one

4-bromo-5-(chloromethyl)-5-hydroxy-3-methylfuran-2-one

5-chloro-4-methoxy-2-methyl-2-penten-4-olide

2-(chloromethyl)-4-methyl-2H-furan-5-one

2-(hydroxymethyl)-4-methyl-2H-furan-5-one