Patent ID: 7511039

Claim:
A compound having either a first structure: or a pharmaceutically acceptable salt thereof, wherein R 1 , R 2 and R 3 are independently selected from amino acid side chain moieties and derivatives thereof; A is selected from â€”(CH 2 ) 1-2 Oâ€” and â€”(CH 2 ) 1-2 Sâ€”; B is N; C is selected from â€”C(â•O)â€”, â€”(CH 2 ) 1-3 â€”, â€”Oâ€”, â€”Sâ€”, â€”Oâ€”(CH 2 ) 1-2 â€” and â€”S(CH 2 ) 1-2 ; Y and Z represent the remainder of the molecule; and any two adjacent CH groups of the bicyclic ring may form a double bond, or a second structure: or a pharmaceutically acceptable salt thereof, wherein X has the structure â€”(CH 2 ) n â€”, where â€œnâ€ is an integer of 0-3, wherein any two adjacent CH groups of the bicyclic ring may form a double bond, wherein R 1 , R 2 , R 3 , C, Y, and Z are as defined above, except with the proviso that when X has the structure â€”(CH 2 ) 0-2 â€”, C has the structure â€”(CH 2 ) 1-2 â€”, and R 2 is H, then R 1 is not H.