1,2,4-Triazolo(4,3-a)pyrimidin-3(2H)-one, 5,6,7,8-tetrahydro-2-phenyl- 105896-19-3 5,6,7,8-Tetrahydro-2-phenyl-1,2,4-triazolo(4,3-a)pyrimidin-3(2H)-one