3,3',5,5'-tetra-tert-butyl-6,6'-dimethyl-[1,1'-biphenyl]-2,2'-diol

1,11-dimethyl-2,4,8,10-tetra-t-butyldibenzo<1,3,2>dioxathiepine 6-oxide

1,3,7,9-tetra-t-butyl-10,11-dihydrophenantro(4,5-def)(1,3,2)dioxathiepine 5-oxide

1,11-bis(bromomethyl)-2,4,8,10-tetra-t-butyldibenzo<1,3,2>dioxathiepine 6-oxide

1,3,7,9-tetra-t-butyl-phenanthro<4,5-def><1,3,2>dioxathiepine 5-oxide