7H-Pyrano[2,3-c]acridin-7-one,1-[9,10- dihydro-1,3-dihydroxy-10-methyl-4-(3- methyl-2-butenyl)-9-oxo-2-acridinyl]-1,2,3,- 12-tetrahydro-6-hydroxy-3,3-dimethyl-