2-羟基-5-(羟基甲基)苯甲酸

1-(3-methoxycarbonyl-4-hydroxybenzylidene)-2-(4-hydroxybenzylidene)hydrazine

dimethyl 5,5'-(hydrazine-1,2-diylidenebis(methanylylidene))bis(2-hydroxybenzoate)

4-[[2-[(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]hydrazinyl]methylidene]cyclohexa-2,5-dien-1-one

4-carboxy-2-methoxycarbonylphenolate