(11bR)-4-hydroxy-2,6-bis(4-nitrophenyl)dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide 1g

(11bR)-4-hydroxy-2,6-bis(4-nitrophenyl)dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide 1g