(6aR,7S,9aS,11R,13aS)-2,3,6,6a,7,8,9,9a,10,11,12,13-dodecahydro-11-hydroxy-6a,7,10,10-tetramethyl-3-oxo-5-diphenoxyphosphinyloxy-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole 以120 mg (82%)的产率得到(6aR,7S,9aS,11R,13aS)-2,3,6,6a,7,8,9,9a,10,11,12,13-dodecahydro-11-hydroxy-5-dihydroxyphosphinyloxy-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole monosodium salt