Compound 20

(3S,6R,9S,12R,15S,18R,21S,24R)-3,15-Bis((1H-indol-3-yl)methyl)-9,21-bis(4-aminobutyl)-6,12,18,24-tetraisobutyl-1,4,7,10,13,16,19,22-octaazacyclotetracosan-2,5,8,11,14,17,20,23-octaone

From: Janus cyclic peptide–polymer nanotubes