2-hydroxy-3-(nitrosomethylidene)-4-phenyl-1,2,5-oxadiazole

2-oxido-4-phenyl-1,2,5-oxadiazol-2-ium-3-carbaldehyde

4-phenyl-3-furoxancarboxamide

4-hydroxyimino-3-phenyl-5(4H)-isoxazolone

3-carboxy-4-phenyl-1,2,5-oxadiazole 2-oxide