6-hydroxy-3,3,12-trimethyl-8-nitro-3,12-dihydro-7H-pyrano[2,3-c]acridin-7-one 7H-pyrano[2,3-c]acridin-7-one, 3,12-dihydro-6-hydroxy-3,3,12-trimethyl-8-nitro- InChI=1/C19H16N2O5/c1-19(2)8-7-10-14(26-19)9-13(22)16-17(10)20(3)11-5-4-6-12(21(24)25)15(11)18(16)23/h4-9,22H,1-3H