Patent ID: 8835392

Claim:
A compound having the formula wherein R 1 is Boc, Z, Ac or H, Z is benzyloxycarbonyl, L is Leu, X is Leu or Asp(OR 4 ), R 2 is CH 2 —CH(CH 3 ) 2 , R 3 is CH 2 —OH, CH═O, CH(OH)—C≡C-phenyl, CH(OH)—C(O)—NH—R 5 or C(O)—C(O)—NH—R 5 , R 4 is t-butyl, benzyl or H, and R 5 is benzyl, 3-picolyl or phenyl, with the exception of a compound wherein X is Leu and R 3 is CH═O, and with the exception of a compound wherein X is Leu, R 1 is Ac and R 3 is CH 2 —OH, and pharmaceutically acceptable salts thereof.