(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, 97%, 250mg