A compound represented by the following general formula (I) or a pharmacologically acceptable salt thereof, wherein A represents a C3 to C12 cycloalkyl group which may be substituted by one to three selected from a fluoro group, a hydroxy group, a C1 to C6 alkyl group, etc; R
1
, R
2
, and R
3
each independently represent a hydrogen atom, a fluoro group, or a C1 to C6 alkyl group; R
4
represents a hydrogen atom or a prodrug group; and Y represents —CH
2
—CHR
5
—CH
2
—NHR
6
(wherein R
5
represents a hydrogen atom, a C1 to C6 alkyl group, or a C1 to C6 alkoxy group, and R
6
represents a hydrogen atom or a prodrug group), or the like exhibits excellent TAFIa inhibitory activity and is useful as a therapeutic drug for myocardial infarction, angina pectoris, acute coronary syndrome, cerebral infarction, deep vein thrombosis, pulmonary embolism, and the like.
A compound represented by the following general formula (I) or a pharmacologically acceptable salt thereof, wherein A represents a C3 to C12 cycloalkyl group which may be substituted by one to three selected from a fluoro group, a hydroxy group, a C1 to C6 alkyl group, etc; R1, R2, and R3 each independently represent a hydrogen atom, a fluoro group, or a C1 to C6 alkyl group; R4 represents a hydrogen atom or a prodrug group; and Y represents —CH2—CHR5—CH2—NHR6 (wherein R5 represents a hydrogen atom, a C1 to C6 alkyl group, or a C1 to C6 alkoxy group, and R6 represents a hydrogen atom or a prodrug group), or the like exhibits excellent TAFIa inhibitory activity and is useful as a therapeutic drug for myocardial infarction, angina pectoris, acute coronary syndrome, cerebral infarction, deep vein thrombosis, pulmonary embolism, and the like.