9-ethynyl-1,4-dimethoxyacridine InChI=1/C17H13NO2/c1-4-11-12-7-5-6-8-13(12)18-17-15(20-3)10-9-14(19-2)16(11)17/h1,5-10H,2-3H acridine, 9-ethynyl-1,4-dimethoxy-