The present invention relates to 2-imino-1,3-thiazine derivatives, in specific, 2-imino-1,3-thiazine derivatives having a selective antagonistic activity or agonistic activity to a cannabinoid type 2 receptor and their pharmaceutical use.
It is found out that compounds represented by general formula (I) bind selectively to cannabinoid 2 receptor (CB2R) and thus exhibit CB2R antagonism or CB2R agonis wherein R1 represents optionally substituted alkylene; R2 represents hydrogen, alkyl, a group represented by the formula —C(═R5)—R6 (wherein R5 represents O or S; and R6 represents alkyl, alkoxy, alkylthio, etc.) or a group represented by the formula SO2R7 (wherein R7 represents allyl, etc.); m is an integer of from 0 to 2; and A represents optionally substituted aryl, etc.