15,35,55,75-Tetra-tert-butyl-32,72-dimethoxy-1,3,5,7(1,3)-tetrabenzenacyclooctaphane-12,52-diol 5g

15,35,55,75-Tetra-tert-butyl-32,72-dimethoxy-1,3,5,7(1,3)-tetrabenzenacyclooctaphane-12,52-diol 5g