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

3-氯-4-(1-甲基乙氧基)-3-环丁烯-1,2-二酮

3-chloro-4-ethylsulfanylcyclobut-3-ene-1,2-dione

1,4-二苯基丁二炔

3,4-bis(phenylethynyl)cyclobut-3-ene-1,2-dione