5,11,17,23-tetra-tert-butyl-25,27-bis[(1,4,7-trioxa-10-azacyclododec-10-yl)ethoxy]-26,28-dihydroxycalix-[4]arene

5,11,17,23-tetra-tert-butyl-26,28-bis[2-(1,4,7,10-tetraoxa-13-azacyclopentadec-13-yl)ethoxy]calix[4]arene-25,27-diol

5,11,17,23-tetra-tert-butyl-25,27-bis[(1,4,7,10,13-pentaoxa-16-azacyclooctadec-16-yl)ethoxy]-26,28-dihydroxycalix[4]arene

di-tert-butyl 2,2'-(((((2,2'-((15,35,55,75-tetra-tert-butyl-32,72-dihydroxy-1,3,5,7(1,3)-tetrabenzenacyclooctaphane-12,52-diyl)bis(oxy))bis(acetyl))bis(azanediyl))bis(ethane-2,1-diyl))bis(azanediyl))bis(carbonyl))(2S,2'S)-bis(pyrrolidine-1-carboxylate)

5,11,17,23-tert-butyl-25,27-bis(chlorocarbonylmethoxy)-26,28-hydroxycalix[4]arene