2-甲基-1,4-丁二醇

diethyl 3-methylcyclopentane-1,1-dicarboxylate

triethyl 1-oxobutane-1,2,3-tricarboxylate

1,4-二溴-2-甲基丁烷

3-甲基-2,5-二吡咯烷酮