Patent ID: 7932294

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein, a is 0; B represents S—S; A represents CH 2 ; A 1 represents CH 2 ; D 1 independently represents a therapeutic agent comprising one or more of the functional groups selected from the group consisting of —NHR 1 , —CONHR 1 , —OC(═O)NHR 1 , —SO 2 NHR 1 , —OSO 2 NHR 1 , —N(R 1 )C(═O)NHR 1 and —N(R 1 )SO 2 NHR 1 , wherein the N atom in said functional groups is directly attached to L 1 ; D 2 independently represents a therapeutic agent comprising one or more of the functional groups selected from the group consisting of —NHR 1 , —CONHR 1 , —OC(═O)NHR 1 , —SO 2 NHR 1 , —OSO 2 NHR 1 , —N(R 1 )C(═O)NHR 1 and —N(R 1 )SO 2 NHR 1 or D 2 is a group or molecule containing one or more water solubilizing functional groups comprising at least the group NHR 1 or D 2 is a vitamin comprising at least the group NHR 1 and wherein the N atom in said functional groups including NHR 1 is directly attached to L 2 ; E represents CH 2 ; L 1 represents —C(O)—O— and L 2 represents —O—C(O)—; R 1 independently represents a bond, H, (C 1 -C 8 )alkyl, substituted (C 1 -C 8 )alkyl, (C 5 -C 14 )aryl, aralkyl or M e+ ; M independently represents Na, K or a pharmaceutically acceptable metal ion; e=1-3; with the proviso that when both, D 1 and D 2 represent therapeutic agents and that D 1 contains the functional group —NHR 1 (wherein R 1 is H), then D 2 represents a structurally different therapeutic agent than D 1 .