| abstract |
A compound represented by the formula 1: wherein Ar represents a group represented by the formula: or (wherein Y represents methylene or an oxygen atom, R1 represents aminosulfonyl, C1-6 alkylaminosulfonyl, C1-6 alkylcarbonylamino or C1-6 alkyl, R3 represents C1-6 alkyl, and R4 represents a hydrogen atom or C1-6 alkyl); X represents a carbonyl group, or a methylene group which may be substituted with a hydroxy group; and L represents an optionally substituted C4-5 alkylene group, or a salt thereof is provided. |