(11bR)-8,9,10,11,12,13,14,15-Octahydro-4-hydroxy-2,6-bis[2,4,6-tris(1-methylethyl)phenyl]-4-oxide-dinaphtho[2,1-d 1 ,2 -f][1,3,2]dioxaphosphepin (11bR)-8,9,10,11,12,13,14,15-Octahydro-4-hydroxy-2,6-bis[2,4,6-tris(1-methylethyl)phenyl]-4-oxide-dinaphtho[2,1-d 1 ,2 -f][1,3,2]dioxaphosphepin