Benzo[a]naphtho[1'',2'':5',6']pyrano[2',3',4':8,1][2]benzopyrano[3,4-j]xanthene-8,18,19-triol,1,2,2a,3,4,5,6,6a,6b,6c,10a,11,12,12a,13,14,15,16,16a,21a-eicosahydro-3,3,6a,10a,13,13,16a,21a-octamethyl-,(2aS,6aS,6bS,6cS,10aS,12aS,16aS,21aS)-