Patent ID: 8309515

Claim:
A compound of formula I: wherein L 1 is a linker group selected from the group consisting of the following: —C(O)—O—, —C(O)— and —C(O)NR 2 ; R 1 is selected from the group consisting of H, OH, C 1-20 alkyl, C 3-20 cycloalkyl and aryl, said latter three groups may be optionally substituted and in which one or more of the carbons of the alkyl, cycloalkyl or aryl groups may optionally be replaced with O, S, N, NR 2 or N(R 2 ) 2 or R 1 is a bioactive agent; R 2 is H or C 1-6 alkyl; v and w are, independently of each other, an integer independently selected from 1 to 4; x is an integer from 10 to 300; y is an integer from 5 to 200; z is an integer from 0 to 100; wherein aryl is mono- or bicyclic aromatic radical containing from 6 to 14 carbon atoms having a single ring or multiple condensed rings; and wherein the optional substituents are selected from the group consisting of halo, OH, OC 1-6 alkyl, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkenyloxy, NH 2 , NH(C 1-6 alkyl), N(C 1-6 alkyl)(C 1-6 alkyl), CN, NO 2 , C(O)C 1-6 alkyl, C(O)OC 1-6 alkyl, SO 2 C 1-6 alkyl, SO 2 NH 2 , SO 2 NHC 1-6 alkyl, phenyl and C 1-6 alkylenephenyl.