Patent ID: 6864350

Claim:
A conjugate, comprising: a water-soluble and non-peptidic polymer covalently attached to the structure: —W—X—P wherein: P is a biologically active molecule; W is selected from the group consisting of —O—C(O)—(CH 2 ) n —O—, —O—(CH 2 ) n —C(O)—O—(CH 2 ) m —, —O—(CH 2 ) n —C(O)—O—(CH 2 ) m —O—, —(CH 2 ) n —OPO 3 —(CH 2 ) m —, and —O—(CH 2 ) n —C(O)—O—(CHR) m —, wherein each R is H or alkyl, provided at least one R is alkyl, n and m each independently range from about 1 to about 5; and X is a covalent linkage.