title: Purine studies. XII; Derivatives resulting from acylation and subsequent ethylation of 4,5-diamino-6-methyl-2-methylthiopyrimidine,.
mesh_terms: D000215:Acylation; D003959:Diamines / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy; D008722:Methods; D008745:Methylation; D011687:Purines / Q000138:chemical synthesis*; D011743:Pyrimidines; D013329:Structure-Activity Relationship
chemical_list: D003959:Diamines; D011687:Purines; D011743:Pyrimidines