7,7'-Dibenzyloxy-8,8'-dimethoxy-2,2'-binaphthyl-1,4:1',4'-dichinon

6-Benzyloxy-4,5-dimethoxy-1-naphthol

7-Benzyloxy-4,8-dimethoxy-1-naphthol

6,,6'-Dibenzyloxy-4,4',5,5'-tetramethoxy-2,2'-binaphthyliden-1,1'-dion

7,7'-Dibenzyloxy-4,4',8,8'-tetramethoxy-2,2'-binaphthyliden-1,1'-dion