4,4-diethyl-5-pentan-3-yloxolane-2,3-dione

4-methyl-4-propyloxolane-2,3-dione

1-O-ethyl 4-O-methyl 2-methyl-3-oxobutanedioate

1-O-ethyl 4-O-methyl 3-methyl-2-oxobutanedioate

2,5-dihydroxy-3,6-di(propan-2-yl)cyclohexa-2,5-diene-1,4-dione