9-acetyl-1,4-dimethylpyrano[3,4-b]indol-3(9H)-one InChI=1/C15H13NO3/c1-8-13-11-6-4-5-7-12(11)16(10(3)17)14(13)9(2)19-15(8)18/h4-7H,1-3H pyrano[3,4-b]indol-3(9H)-one, 9-acetyl-1,4-dimethyl-