Patent ID: 8119689

Claim:
A Bisacyloxypropylcysteine-conjugate according to formula 1: where R 1 and R 2 can be identical or different and are acyl moieties; L is a linker moiety selected from the group of NH, O, S or C(O)O; R 3 is a covalently linked conjugate moiety comprising at least two polyalkylene glycol units of the formula: X 1 —[(CHR 4 ) x —O] n —(CHR 4 ) y — which may be identical or different; where X 1 is hydrogen or a hydrocarbon which may contain heteroatom(s); R 4 is independently any one of hydrogen or straight or branched C 1 -C 6 alkyl group, OR 5 or CO—R 6 ; R 5 is independently any one of hydrogen or straight or branched C 1 -C 6 alkyl group; R 4 is independently any one of hydrogen, OH, OR 5 or NR 7 R 8 ; R 7 and R 8 are independently any one of hydrogen or hydrocarbon which may contain heteroatom(s) and which may form a ring; n is an integer of 1 to 100; x is independently an integer of 1 to 10; and y is an integer of 0 to 10.