(11bS)-2,6-Bis([1,1'-biphenyl]-4-yl)-4-hydroxy-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin

(11bS)-2,6-Bis([1,1'-biphenyl]-4-yl)-4-hydroxy-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin