4-phenyl-1H-1,2,4-triazol-5-one

2,4-Dihydro-4-phenyl-3H-1,2,4-triazol-3-one

4,5-Dihydro-5-oxo-4-phenyl-1H-1,2,4-triazole, (1,5-Dihydro-5-oxo-4H-1,2,4-triazol-4-yl)benzene