3-[4-(dimethylamino)phenyl]-4-hydroxycyclobut-3-ene-1,2-dione

3-chloro-4-[4-(dimethylamino)phenyl]cyclobut-3-ene-1,2-dione

1,4-双(三甲硅基)-1,3-丁二炔

3,4-bis[(trimethylsilyl)ethynyl]-3-cyclobutene-1,2-dione

3,4-二(环己基氨基)-3-环丁烯-1,2-二酮