(11bR)-2,6-bis[2,6-bis(1-methylethyl)-4-tricyclo[3.3.1.13,7]dec-1-ylphenyl]-4-hydroxy-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin

(11bR)-2,6-bis[2,6-bis(1-methylethyl)-4-tricyclo[3.3.1.13,7]dec-1-ylphenyl]-4-hydroxy-4-oxide-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin,