Patent ID: 7709443

Claim:
A cyclic peptide compound of a formula wherein each of R 1 -R 5 is independently selected from H and alkyl moieties; X 1 is selected from O and NR 4 ; R 1 ′ is X 2 ArCH 2 —, wherein X 2 is selected from Br, Cl and alkyl, and Ar is selected from aryl and heteroaromatic moieties; and each of R 2 ′-R 5 ′ is independently selected from R 1 ′, CH 3 —, (CH 3 ) 2 CH—, (CH 3 ) 2 CHCH 2 —, CH 3 CH 2 (CH 3 )CH— and CH 3 S CH 2 CH 2 — moieties.