2,3,5,6-四甲基苯胺

2'',3''a,4'',5'',6'',7''-六氢-螺[环己烷-1,3''-吲唑]

penta-1,3-diyne

戊-3-炔-2-酮

ethyl-(1-methylene-but-2-ynyl)-ether