Patent ID: 8183231

Claim:
A compound, including enantiomers, stereoisomers, and tautomers of said compound and pharmaceutically acceptable salts thereof, with said compound having the general structure shown in formula I: wherein: R is C 1-8 alkyl, C 3-8 cycloalkylC 1-4 alkyl, arylC 1-4 alkyl or fluoroalkyl of the formula C n H x F y wherein n is an integer from 1 to 4, x is an integer from 0 to 8, y is an integer from 1 to 9 and sum of x and y is 2n+1; R 1 is hydrogen or hydroxy; P 1 and P 2 are a bond; and P 3 is Gly, D- or L-Ala, Ile, Leu, Lys, Phe, Pro, Trp, Tyr, Val, Nval, Nle, Sar, Ser, bAla, bVal, Met, Orn, Thr, Cys, His, Arg, Asp, Glu, Asn and Gln.