Patent ID: 7405198

Claim:
An erythropoietin peptide conjugate comprising a sialic acid moiety having the formula: wherein D is a member selected from —OH and R 1 -L-HN—; G is a member selected from R 1 -L- and —C(O)(C 1 -C 6 )alkyl; R 1 is a moiety comprising a branched poly(ethylene glycol) residue; and L is a linker which is a member selected from a bond, substituted or unsubstituted alkyl and substituted or unsubstituted heteroalkyl, such that when D is OH, G is R 1 -L-, and when G is —C(O)(C 1 -C 6 )alkyl, D is R 1 -L-NH—, wherein said branched poly(ethylene glycol) residue has a formula which is a member selected from: wherein q1 is an integer from 0 to 20; q, q′ and q″ are integers independently selected from from 1 to 20; and e, f and f′ are integers independently selected 1 to 2500.