5,11,17,23-Tetra­kis(1,1-di­methyl­eth­yl)-26,28-di­hydroxy­calix[4]arene-25,27-mono­thia­crown-3

The title calix[4]arene compound [systematic name: 3,9,15,34-tetra-tert-butyl-19,29-dioxa-24-thia­hexa­cyclo­[15.13.7.1(7,11).1(32,36).0(5,30).0(13,18)]nona­triaconta-1(30),2,4,7,9,11(39),13,15,17,32,34,36(38)-dodeca­ene-38,39-diol], C(52)H(70)O(4)S, displays a cone-like conformation, the opposite arene rings bridged by the mono­thia­crown-3 unit are nearly parallel [dihedral angle = 16.01 (18)°], whereas the other opposite arene rings are twisted to each other at an angle of 74.41 (17)°. Intra­molecular O—H⋯O hydrogen bonds help to stabilize the mol­ecular structure. In the crystal, a C—H⋯π inter­action occurs. One of the tert-butyl groups is disordered over two sets of sites with a site-occupancy ratio of 0.70:0.30.