【subject】 A therapeutic medicine or a preventive medicine of the H5N1 type influenza.【means for solving the problems】 The present invention provides a therapeutic medicine or a preventive medicine of H5N1 type influenza that contains compound of the following formula (I) as active ingredient[wherein,R1and R2represent H and an alkanoyl group X represents a halogen atom, OH, an alkoxy group,an alkanoyloxy group R3represents H, an alkyl group provided that R1and R2represent H X represents OH R3represents H are excluded]提供H5N1型流行性感冒之治療劑或預防劑。以如下式(I)化合物為有效成分含有之H5N1型流行性感冒之治療劑或預防劑,[式中R1、R2:H、烷醯基;X:鹵原子、OH、烷氧基、烷醯氧基;R3:H、烷基,但R1、R2:H;X:OH而R3:H除外]。
