(11bR)-4-Hydroxy-2,6-di-o-tolyldinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide 5g

(11bR)-4-Hydroxy-2,6-di-o-tolyldinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide 5g