3-hydrazinyl-6-phenyl-2H-1,2,4-triazin-5-one

3-phenyl-6,7-dihydro-[1,3]thiazolo[2,3-c][1,2,4]triazin-4-one

2,3-Dihydro-6-phenyl-7H-thiazolo(3,2-b)(1,2,4)triazin-7-on