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1-(1,2-Dioxo-2-(3-indolyl)ethyl)indole

(2S,2'S)-dimethyl 3,3'-(1H,1'H-[2,2'-biindole]-3,3'-diyl)bis(2-acetamidopropanoate)

(S)-2-acetamido-3-(3'-((S)-2-acetamido-3-methoxy-3-oxopropyl)-1H,1'H-[2,2'-biindol]-3-yl)propanoic acid

(S)-methyl 2-acetamido-3-(12H-pyrido[1,2-a:3,4-b']diindol-13-yl)propanoate