(R)-4-Hydroxy-2,6-bis(2,4,6-tri-tert-butylphenyl)dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide

(R)-4-Hydroxy-2,6-bis(2,4,6-tri-tert-butylphenyl)dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide