Compounds represented by the general formula (1) or salts thereof or solvates of both; PAR-2 antagonists containing the compounds; and preventive or therapeutic agents for PAR-2 related diseases containing the antagonists as the active ingredient: (1) wherein R
1
is hydrogen, halogeno, or a group represented by the general formula (2): (wherein R
11
is straight-chain or branched C
1-6
alkylene or the like; and R
12
and R
13
together with the nitrogen atom adjacent to them form a 5- to 7-membered ring); R
2
is straight-chain or branched C
1-6
alkyl or the like; R
3
and R
4
are each independently hydrogen, one to three halogen atoms, or the like; and A
1
-A
2
-A
3
is a tripeptide residue composed of α-amino acids each independently selected from the group consisting of glycine, alanine, cyclohexylalanine, and so on.