methyl (1,1,1-triphenyl-14,17,20,23,26-pentaoxa-2-thiaoctacosan-28-oyl)-D-phenylalanyl-D-phenylalaninate

Boc-Lys(Z)-Leu-Val-Phe-Phe-OMe

(S,S)-N,N'-oxalyl-bis(phenylalanyl-phenylalanine)

(S,S)-N,N'-oxalyl-bis(phenylalanyl-phenylalaninamide)

N-maleoyl-L-Phe-L-Phe-OMe