... of l-Aroyl-5-methyl-2-thiobiurets Nam Sook Cho* and Hyun II Shon Department of Chemistry, Chungnam National University, Dae Jeon 305-764, Korea Cyril Párkányi* Department of Chemistry, Florida Atlantic ... [4] L. Taliani and J. Perronnet, J. Heterocyclic Chem., 16,961 (1979 ...