(11aR)-12-Hydroxy-4,4,7,7-tetramethyl-1,10-diphenyl-4,5,6,7-tetrahydrodiindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocine 12-oxide

(11aR)-12-Hydroxy-4,4,7,7-tetramethyl-1,10-diphenyl-4,5,6,7-tetrahydrodiindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocine 12-oxide,