3,4-diphenoxycyclobut-3-ene-1,2-dione

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

3,4-dipentoxycyclobut-3-ene-1,2-dione

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

2,3-二羟基-2-环丙烯-1-酮