title: Pyridothiazines. I. Synthesis of 3H-2-imino-4-oxopyrido-(2,3-e)(1,3)thiazine and 3H-2,4-dioxopyrido(2,3-e)(1,3)thiazine.
mesh_terms: D003500:Cyclization; D006868:Hydrolysis; D007097:Imines; D009539:Nicotinic Acids; D011725:Pyridines / Q000138:chemical synthesis*; D013055:Spectrophotometry, Infrared; D013843:Thiazines / Q000138:chemical synthesis*; D013890:Thiourea
chemical_list: D007097:Imines; D009539:Nicotinic Acids; D011725:Pyridines; D013843:Thiazines; D013890:Thiourea