2,4,6(1H,3H,5H)-pyrimidinetrione 67-52-7 InChI=1/C4H4N2O3/c7-2-1-3(8)6-4(9)5-2/h1H2,(H2,5,6,7,8,9 pyrimidine-2,4,6(1H,3H,5H)-trione