329761-98-0 5,6,8-trimethyl[1,2,5]oxadiazolo[3',4':4,5]pyrido[2,3-d]pyrimidine-4,7,9(5H,6H,8H)-trione 3-oxide 189998-40-1 5-methyl-6,8-diphenyl[1,2,5]oxadiazolo[3',4':4,5]pyrido[2,3-d]pyrimidine-4,7,9(5H,6H,8H)-trione 3-oxide 298213-97-5 1H,3H,5H-[1,3,4]Oxadiazolo[3,4-c][1,3,4]oxadiazin-5-one,dihydro-8-phenyl-1,3-dipropyl-, (1R,3S,8R)-