5-甲基-1,3,4-噁二唑-2-羧酸乙酯

2-methyl-5-p-tolyl-1,3,4-oxadiazole

5-甲基-1,3,4-恶二唑-2-羧酸钾

2,5-二甲基-1,3,4-噁二唑

5-methyl-2-trityltetrazole