The detailed structure of the title compound (5-acetyl-4-methyl-2-methylthiopyrimidine diaminomethylenehydrazone) revealed distinct differences between it and its already published dichloride salt. It is obviously characterized by its diaminomethylenehydrazono chain and the more symmetrical pyrimidine ring. This observation helps in understanding the chemical behavior of the molecule and sheds more light on the possible mechanism of action of antitumor drugs such as mitoguazone
