Thiobarbituric acid504-17-6100 % similar Barbituric acid67-52-748 % similar N-(1,4,5,6-Tetrahydro-4,6-dioxo-2-pyrimidinyl)cyanamide55067-10-244 % similar Malonic dihydrazide3815-86-939 % similar Rhodanine141-84-437 % similar 2-Methyl-4,6-pyrimidinedione40497-30-133 % similar 2,5-Diketopiperazine106-57-032 % similar Hydantoin461-72-331 % similar 1-Methyl-2,4,6(1H,3H,5H)-pyrimidinetrione2565-47-130 % similar