6H-Pyrano[3,2-b]acridin-6-one,2,3,4,11-tetrahydro-5-hydroxy-2,2,11-trimethyl-4-(2,3,7,12-tetrahydro-6-hydroxy-3,3,12-trimethyl-7-oxo-1H-pyrano[2,3-c]acridin-5-yl)-