Patent ID: 8906946

Claim:
A compound having formula (I): and a pharmaceutically acceptable salt thereof, wherein: R is selected from: H, Br, CN, NO 2 , SO 2 NH 2 , SO 2 NHR′ and SO 2 N(R′) 2 , where R′ is selected from linear or branched C 1 -C 4 alkyl; X is selected from: F, Cl, C 1 -C 3 alkyl, NH 2 and OH; Y is selected from: —O—, CH 2 , NH and SO 2 ; R1 and R2, independently one from the other, are selected from H, F and linear or branched C 1 -C 4 alkyl; R3 and R4, independently one from the other, are selected from H and linear or branched C 1 -C 4 alkyl; Z is selected from: NR6 and R6R7N + , where R6 and R7, independently one from the other, are selected from: H and linear or branched C 1 -C 4 alkyl; R5 is a residue selected from: H and linear or branched C 1 -C 4 alkyl, and Het is a heteroaryl group selected from pyrrolyl, N-methylpyrrolyl, thiophenyl, furyl and pyridinyl, unsubstituted or substituted with one or more substituents selected from F, Cl, CH 3 , NH 2 and OH.