New biologically active substances

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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.