| 摘要 |
: Disclosed are a dicarboxylic acid compound represented by the formula (I): (I) wherein R represents hydrogen atom, a lower alkyl group, phenyl group or hydroxyl group; R1 represents a straight or branched alkyl group having 1 to 10 carbon atoms or a lower alkyl group substituted by a group selected from aryl group, a sulfur- or nitrogen-con-taining heterocyclic monocyclic group and a cycloalkyl group having 4 to 8 carbon atoms; R2 represents a substituted or unsubstituted aryl group, a cycloalkyl group having 4 to 8 carbon atoms or a sulfur-contain-ing or nitrogen-containing heterocylcic group; X represents sulfur atom, oxygen atom or a substituted or unsubstituted imino group; y1 represents imino group, oxygen atom or sulfur atom and y2 represents nitrogen atom, or yl represents a vinylene group and y2 represents a group: -CH=; m represents U to 3; and n represents O or 1, an ester thereof or pharmaceutically acceptable salts thereof, and a process for preparing the same.
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