1 074 [propylamino-3-hydroxy-butan-1,4-dionyl]-isoleucyl-proline 1.000 2 WRH Methyl (2s)-1-[(2s,3s)-3-methyl-2-[[(3s)-3-oxidanyl-4-oxidanylidene-4-(propylamino)butanoyl]amino]pentanoyl]pyrrolidine-2-carboxylate 0.897 3 EP0 N-[(3r)-4-ethoxy-3-hydroxy-4-oxobutanoyl]-L-isoleucyl-L-proline 0.767