Patent ID: 7345040

Claim:
A compound having the structure: or a pharmaceutically acceptable salt or stereoisomer thereof, wherein R 1 is —X—R 5 , where X is —C(═O)NH—, and R 5 is an amino acid side chain moiety or an amino acid side chain derivative selected from the following list of amino acid side chain derivatives: substituted or unsubstituted alkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocycle and heterocyclealkyl moieties; R 2 is hydrogen or —Y—R 6 , where Y is a direct bond, —NH—, —NHC(═O)—, —NHC(═O)O—, —NHC(═O)NH— or —NHSO 2 —, and R 6 is an amino acid side chain moiety or an amino acid side chain derivative selected from the list of amino acid side chain derivatives above; R 3 is —Z—R 7 , where Z is a direct bond, —(CH 2 ) m C(═O)NR 8 —, —(CH 2 ) k NHC(═O)— or —(CH 2 ) k NHC(═O)NR 8 —, R 7 and R 8 are independently amino acid side chain moieties or an amino acid side chain derivatives selected from the list of amino acid side chain derivatives above, m is an integer from 1 to 4 and k is 1 or 2; and R 4 is selected from a solid support, an amino acid side chain moiety, or the list of amino acid side chain derivatives above.