Patent ID: 8080522

Claim:
A compound of formula (I): Z-[Cys x (PEG-M)]-(Aa) n -T (I) wherein: Z is H, methyl, ethyl, propyl, isopropyl, butyl, pentyl, isopentyl, formyl, acetyl, propionyl, carbamoyl, benzyloxycarbonyl, or fluorenylformyl; PEG is RO(CH 2 CH 2 O) m —CH 2 CH 2 —, R═H or CH 3 , m=5-2000; Cys is cysteine and covalently linked with M group via side chain sulfide atom; T represents a natural Tα1 complete sequence or an analogue thereof in which any site is substituted by at least one Cys, and the N-terminal of T or analogue thereof is acetylated; x represents the site of Cys in T, and x=5-24; Aa represents any one of 20 natural amino acids or the combination thereof, n=0-10.