when Z is --OH, X must be --H and Y must be ##STR8## and where n is an integer of 2 to 6.Preferably n is an integer of 2 or 3 and the ##STR9## portion of the spacer is derived from succinic or glutaric anhydride.The intermediates described by the above formula may be broken down into two subgroups.The first subgroup is the glucosamine derivatives wherein Z is --H, Y is --H and X is ##STR10## wher