4-[(6-oxocyclohexa-2,4-dien-1-ylidene)methyl]-3-phenyl-2H-1,2-oxazol-5-one

4,4-dibromo-3-phenyl-1,2-oxazol-5-one

4-nitroso-3-phenyl-2H-1,2-oxazol-5-one

3-phenyl-4-piperonylidene-4H-isoxazol-5-one