(R)-2-Amino-4-methyl-2-naphthalen-2-ylmethyl-pentanoic acid methyl ester

(2R,5S)-2,5-Diisobutyl-3,6-dimethoxy-2-prop-2-ynyl-2,5-dihydro-pyrazine

(R,R)-N,N'-oxalyl-bis(leucyl-leucine)

(S,S)-N,N'-oxalyl-bis(leucyl-leucinamide)

Z(OMe)-Gly-Leu-Leu-NH-NH2