Patent ID: 7163921

Claim:
A compound of formula (1) or a pharmaceutically acceptable salt thereof: in which A is alkylene, formula (2) or formula (3): X and Y are the same or different and each represents —CONH— or —CH 2 NH—; R 1 , R 2 and R 3 are the same or different and each represents alkyl, aryl or heteroaryl, wherein said alkyl aryl and heteroaryl are optionally substituted by 1 to 3 same or different substituents selected from the group consisting of halogen, nitro, hydroxy, cyano, carbamoyl, alkyl, aryl optionally substituted by hydroxy, heteroaryl optionally substituted by hydroxy, alkenyl, alkynyl, alkoxylcarbonyl, acyl, amino, monoalkylamino, dialkylamino, alkoxy, aryloxy, arylalkyloxy, alkylthio, arylalkylthio, heteroarylalkylthio, arylsulfonyl, alkylsulfonyl and guanidino; and Z represents —CON(R 4 )R 5 or —CH 2 N(R 4 )R 5 wherein R 4 and R 5 are the same or different and each represents hydrogen, alkyl, aryl or heteroaryl, wherein said alkyl, aryl and heteroaryl are optionally substituted by 1 to 3 same or different substituents selected from the group consisting of halogen, nitro, hydroxy, carboxy, cyano, carbamoyl, alkyl, aryl optionally substituted by hydroxy, heteroaryl optionally substituted by hydroxy, alkenyl, alkynyl, alkoxycarbonyl, acyl, amino, monoalkylamino, dialkylamino, alkoxy, aryloxy, arylalkyloxy, alkylthio, arylalkylthio, heteroarylalkylthio, arylsulfonyl, alkylsulfonyl, guanidino, N-monoalkylcarbamoyl, N,N-dialkylcarbamoyl and hydroxymethyl.