(11bS)-4-Hydroxy-2,6-bis[4-(2-naphthalenyl)phenyl]-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin

(11bS)-4-Hydroxy-2,6-bis[4-(2-naphthalenyl)phenyl]-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin