The chemical structure of uracil, showing its single-ring pyrimidine structure. Uracil forms hydrogen bonds with adenine in RNA, contributing to the molecule's structure and function. (Image: Public ...

Lyttle and Petering 1,2 synthesized 5-bis-(2-chloroethyl)-aminouracil, uracil mustard, or NSC-34462 or U-8344 (Fig. 2), replacing the methyl group of nitrogen mustard with a physiologically active ...