This will basically depart, forming a carbocation intermediate. And then this can act as a nucleophile attacking this carbon either from the top side or bottom side. And ultimately we form a mixture of these two molecules. These two products and these two products are known as glycosides. So this is the methyl beta D glucocide and this is the methyl alpha deglucouranicide. And notice the difference between these two molecules is simply the orientation, the stereo chemistry of this group attached to carbon number one, in the beta case, this points in the same direction as this group.