The pharmaceutically more preferable compounds of the present invention are compounds of the formula I! wherein X is an oxygen atom, OY is a lower alkanoyloxy group or a hydroxy group, Z is a 2,3-di-O-(lower alkanoyl)-??-D-glucopyranosyl group, and especially 2'- 2,3-di-O-(lower alkanoyl)-??-D-glucopyranosyloxy!-6'-hydroxy-3-(5-benzo b!furanyl)propiophenone and 2'- 2,3-di-O-(lower alkanoyl)-??-D-g