Patent ID: 7759519

Claim:
A compound having the general structure of formula (I): where Y is either: (Aa) x or a group of formula (II) wherein R 1 and R 2 , which may be the same or different, is a saturated or unsaturated, linear or branched hydrocarbon chain of up to 24 carbon atoms m is 1 to 10; n is 1 to 10; Aa, which may be the same or different at each occurrence, is (H 2 N(CH 2 ) 3 ) 2 N(CH 2 )C(O))—, (H 2 NCH 2 ) 2 CHC(O)—, or an enantiomer of HOCH 2 CH(NH 2 )C(O)—, NH 2 (CH 2 ) 4 CH(NH 2 )C(O)—, NH 2 (CH 2 ) 3 CH(NH 2 )C(O)—, NH 2 CH 2 CH 2 CH(NH 2 )C(O)—, NH 2 CH 2 CH(NH 2 )C(O)—, or H 2 N(CH 2 ) 4 CH(NH 2 )C(O)NHCH(CH 2 OH)C(O)—; x is 1; p is 0 to 6; q is 1 to 6; r is 1 to 6; s is 1 to 6; z is 0 or 1; X is N, CH or C with the proviso that when X is N, z is 0 or 1; when X is CH, z is 0; and when X is C, z is 1; or a pharmaceutically acceptable salt thereof.