(5E)-5-(6-oxocyclohexa-2,4-dien-1-ylidene)-1,3,4-oxathiazolidin-2-one

2,5-二羟基苯甲酰胺

2,3-二羟基苯甲酰胺

6-(5-methyl-1,2,4-oxadiazol-3-ylidene)cyclohexa-2,4-dien-1-one

2-(beta-羟基乙氧基)苯甲酰胺