1-Methyl-1,2,3-benzotriazin-4(1H)-one

The title compound is prepared by methylation of 1,2,3-benzotriazin-4(3H)-one, protected at the 3-position by a 1-ethoxyethyl substituent, followed by removal of the protective group; the unusual physicochemical properties of the compound are probably associated with a highly polar structure.