2,2'-(((1,4-phenylenebis(methylene))bis(1H-indole-1,3-diyl))bis(sulfanediyl))diacetic acid

(2S,2'S)-2,2'-((2,2'-((1,4-phenylenebis(methylene))bis(1H-indole-1,3-diyl))bis(2-oxoacetyl))bis(azanediyl))dipropionic acid

(2S,2'S)-2,2'-((2,2'-((1,4-phenylenebis(methylene))bis(1H-indole-1,3-diyl))bis(2-oxoacetyl))bis(azanediyl))bis(3-(1H-indol-3-yl)propanoic acid)