5-((2,4-Dihydroxybenzylidene)amino)-1,3-dihydro-2H-benzo[d]imidazole-2-thione
N'-(3,4-Dihydroxybenzylidene)-3-hydroxy-2-naphthohydrazide
2-(3,4-Dihydroxybenzylidene)benzofuran-3(2H)-one
5-Bromo-3-(3-bromo-4,5-dihydroxybenzylidene)indolin-2-one
