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摘要

This invention relates to carbostyril derivatives represented by general formula (1), a process for their preparation, and an agent for inhibiting agglutination of platelets containing them as an active ingredient, wherein A represents a lower alkylene group, R1 represents a substituted or unsubstituted cycloalkyl-lower alkyl group, a cycloalkyl group, a tetrahydropyranyl-lower alkyl group, a lower alkylenedioxy-substituted lower alkyl group, a substituted phenyl-lower alkyl group or a lower alkyl-substituted piperidinyl-lower alkyl group, R2 represents a substituted or unsubstituted 5- or 6-membered, saturated or unsaturated heterocyclic-lower alkyl group, a tetrahydropyranylthio-lower alkyl group, a pyridylthio-lower alkyl group, a lower alkylene-dioxy-substituted lower alkyl group or a substituted or unsubstituted lower alkyl group, and the carbon-to-carbon bond between the 3-position and the 4-position of the carbostyril skeleton represents either a single or a double bond.