| 主权项 |
1. A compound of formula (I): or a pharmaceutically acceptable salt thereof, wherein: Y is a group of formula: Y′—NH— or (Y′)2—N—, wherein Y′ is the same or different and is selected from the group consisting of: a linear or branched saturated or unsaturated C1-C20 alkyl group; and a C1-C10 alkyl group interrupted by one or more atoms or groups selected from: —P— and —O—(HO—P═O)—O—, said C1-C10 alkyl group being optionally substituted by one or more groups selected from: hydroxy —OH, carboxy —COOR1, oxycarbonyl-(C1-C30)alkyl and oxycarbonyl-(C2-C30)alkertyl group and wherein R1 is selected from: hydrogen H and a linear or branched C1-C10 alkyl group; L is a bivalent linker selected from: aliphatic C3-C10 cyclic or heterocyclic ring, linear or branched C1-C6 alkyl group and C2-C6 alkenyl or alkynyl group, optionally substituted and optionally interrupted with a group or atom selected from: carbonyl —C═O, thiocarbonyl —C═S, amino —NR1-, carboxy —COO—, oxycarbonyl —OCO—, amido —NR1CO— or —CONR1-, oxygen —O— and sulphur —S—, wherein R1 is as above defined; RI-IV are each independently selected from: hydrogen H, carboxy —COOR1, and —(C1-C6)alkylcarboxy group, wherein R1 is as above defined. |
