6,6'-((3,3'-Di-tert-butyl-5,5'-dimethoxy-[1,1'-biphenyl]-2,2'-diyl)bis(oxy))didibenzo[d,f][1,3,2]dioxaphosphepine

6,6'-((3,3'-Di-tert-butyl-5,5'-dimethoxy-[1,1'-biphenyl]-2,2'-diyl)bis(oxy))didibenzo[d,f][1,3,2]dioxaphosphepine