Patent ID: 8420850

Claim:
A compound of formula (I) or a salt thereof, (X—S) m -D (I)(I) wherein -D is a radical derived from a drug or an active metabolite of a drug susceptible to form at least one of an amide bond, an urea bond, a carbamate bond, an ether bond, a thioamide bond, a disulfide bond, a siloxane bond, a carbonate bond, an amine bond, or an ester bond with S; —S— is a biradical consisting of a branched or unbranched, saturated or unsaturated C 2 -C 299 hydrocarbon chain, bonded for one extreme to radical X and for the other extreme susceptible to form at least one of an amide bond, an urea bond, a carbamate bond, an ether bond, a thioamide bond, a disulfide bond, a siloxane bond, a carbonate bond, an amine bond, or an ester bond with D, said hydrocarbon chain having at the extreme forming the bond with D an atom or group of atoms selected from the group consisting of an oxygen atom, a sulphur atom, a radical of formula NR 2 or a radical of formula CO, said hydrocarbon chain optionally having one or more non-terminal carbon atoms replaced by an oxygen atom, a sulphur atom, or group of formula NR 2 , and wherein optionally at least one hydrogen atom of said hydrocarbon chain is substituted by at least one radical selected from the group consisting of an halogen or a C 1 -C 8 -alkyl radical; —R 2 is a radical selected from the group consisting of hydrogen, and a linear or branched C 1 -C 8 -alkyl; —X is a radical selected from the group consisting of —NH 2 , NCO, and —OH; and m is an integer from 2 to 4.