N-<3-(2,3-dibenzyloxybenzoylamino)propyl>-N-<4-(2,3-dibenzyl-oxybenzoylamino)-butyl>-2,3-dibenzyloxybenzoyl-L-alanylamide

N-<3-(2,3-dibenzyloxybenzoylamino)propyl>-N-<4-(2,3-dibenzyl-oxybenzoylamino)-butyl>-2,3-dibenzyloxybenzoyl-valylamide

L-N-<3-(2,3-dibenzyloxy-benzoylamino)propyl>-N-<4-(2,3-dibenzyl-oxybenzoylamino)butyl>-2,3-dibenzyloxybenzoyl-phenylalanylamide

1-(2,3-dihydroxybenzamido)-2-(2,3-dimercaptobenzamido)-2,2'-dimethylethane

N,N'-(([1,1'-binaphthalene]-2,2'-diylbis(oxy))bis(ethane-2,1-diyl))bis(2,3-dihydroxybenzamide)