1,2,4-Triazolo(4,3-b)(1,2,4)triazin-3(2H)-one, 7-phenyl- 1,2,4-Triazolo(4,3-b)-1,2,4-triazine, 3-hydroxy-7-phenyl- 7-Phenyl-1,2,4-triazolo(4,3-b)(1,2,4)triazin-3(2H)-one 86869-93-4