3,3'-(Hydrazine-1,2-diylidenebis(methaneylylidene))diphenol
2,2'-(Hydrazine-1,2-diylidenebis(methanylylidene))diphenol
4,4'-(Hydrazine-1,2-diylidenebis(methanylylidene))bis(2,6-dimethoxyphenol)
2,2'-(Ethane-1,2-diylidenebis(azanylylidene))diphenol
