(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)acetic acid 5-pyrimidineacetic acid, 1,2,3,4-tetrahydro-2,4-dioxo- InChI=1/C6H6N2O4/c9-4(10)1-3-2-7-6(12)8-5(3)11/h2H,1H2,(H,9,10)(H2,7,8,11,12