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