The present invention relates to a polysubstituted imidazolo[4,5-c][1,2]
thiazine derivative and a use of an agent comprising same as an
active agent, which is useful for infectious diseases associated with
vascular inflammation caused by HMGB1
protein activity. It has been found that the polysubstituted imidazolo[4,5-c][1,2]
thiazine derivative of the present invention increases the
sepsis survival rate as a result of searching for
antiseptic effects through CLP-induced
sepsis animal experiments. Accordingly, the agent comprising the polysubstituted imidazolo[4,5-c][1,2]
thiazine derivative or a pharmaceutically acceptable salt thereof as an
active agent may be advantageously used as a therapeutic agent for infectious diseases and vascular inflammatory diseases including
sepsis caused by HMGB1
protein activity.