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

3-甲基丁烷-1,2-二醇

2-甲基-1,4-丁二醇

3-methylbut-3-ene-1,2-diol

3-methoxy-4-methylfuran-2,5-dione