Oligosaccharide derivative

摘要

Compounds having the formula (I): wherein A represents a group such as a cyclic group, R¹ and R² represent groups such as alkyl groups or hydroxymethyl groups, and n represents 1 or 2, or pharmacologically acceptable salts thereof or pharmacologically acceptable esters thereof have superior activity and stability, and are useful for the treatment and/or prevention of diabetes mellitus, or the like.