4-hydroxy-6H-pyrido[2,3,4-kl]acridin-6-one 6H-pyrido[2,3,4-kl]acridin-6-one, 4-hydroxy- InChI=1/C15H8N2O2/c18-11-7-12(19)15-13-9(5-6-16-14(11)13)8-3-1-2-4-10(8)17-15/h1-7,18