N-methoxy-N-methyl-3,4-dimethylpyrrole-2-carboxamide

2-ethoxycarbonyl-3,6-dihydro-4,5-dimethyl-1,2-thiazine 1-oxide

2,3-二甲基-1,3-丁二烯

1-乙酰基-3,4-二甲基-1,5-二氢-2H-吡咯-2-酮