(11bR)-8 – 9 – 10 – 11 – 12 – 13 – 14 – 15-Octahydro-4-hydroxy-2 – 6-bis(4-nitrophenyl)-4-oxide-dinaphtho[2 – 1-d:1′ – 2′-f][1 – 3 – 2]dioxaphosphepin