PROBLEM TO BE SOLVED: To provide a novel compound useful as an aminopeptidase A inhibitor.SOLUTION: This invention provides a compound represented by formula (I) or salt thereof, and a pharmaceutical composition comprising the same, wherein R-Rare H, a hydroxy group, a halogen atom or the like R-Rare H or the like *1 and *2 are asymmetric carbon atoms and may be any of D and L configurations Y is a carboxyl group or the like and Z is H or a substituted benzoylamino imino methyl group or the like.
