Uric acid69-93-2100 % similar 3H-1,2,3-Triazolo[4,5-D]pyrimidine-5,7(4H,6H)-dione1468-26-450 % similar Xanthine69-89-648 % similar 7-Deazaxanthine39929-79-841 % similar 1,2,3,7,8,9-Hexahydro-2,8-dithioxo-6H-purin-6-one15986-32-039 % similar Lumazine487-21-838 % similar 6,7-Dimethylpterin611-55-237 % similar Lumichrome1086-80-233 % similar 5,6-Dimethyluracil26305-13-532 % similar 5,6-Diaminouracil3240-72-032 % similar Urazole3232-84-632 % similar Melamine cyanurate37640-57-632 % similar Ammelide645-93-232 % similar Cyanuric acid108-80-532 % similar 6-Thioxanthine2002-59-731 % similar Pterin2236-60-431 % similar