135131-00-9 3,3a-Dihydro-2-phenylpyrazolo(1,5-d)(1,2,4)triazin-4(5H)-one BRN 4748973 Pyrazolo(1,5-d)(1,2,4)triazin-4(5H)-one, 3,3a-dihydro-2-phenyl-