InChI=1S/C18H11NO2/c20-19(21)18-11-17-13-6-2-1-5-12(13)9-10-15(17)14-7-3-4-8-16(14)18/h1-11H/i1D,2D,3D,4D,5D,6D,7D,8D,9D,10D,11D