4-{(E)-2-[4-(dimethylamino)phenyl]vinyl}-3-nitrobenzoic acid InChI=1/C17H16N2O4/c1-18(2)15-9-4-12(5-10-15)3-6-13-7-8-14(17(20)21)11-16(13)19(22)23/h3-11H,1-2H3,(H,20,21)/b6-3 benzoic acid, 4-[(E)-2-[4-(dimethylamino)phenyl]ethenyl]-3-nitro-