1 CX9 3,7-dimethyl-1-[3-(3-methyl-2,6-dioxo-9h-purin-1-yl)propyl]purine-2,6-dione 1.000 2 DW0 1,1'-propane-1,3-diylbis(3,7-dimethyl-3,7-dihydro-1h-purine-2,6-dione) 0.966