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5,6-Diamino-1-methyluracil6972-82-3100 % similar 5,6-Diamino-1,3-dimethyluracil5440-00-643 % similar 6-Amino-3-methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione21236-97-541 % similar 3-Methyl-6-methylaminouracil5759-63-733 % similar