4-(4-Nitro-phenylethynyl)-phenylamine 4-[(4-nitrophenyl)ethynyl]aniline InChI=1/C14H10N2O2/c15-13-7-3-11(4-8-13)1-2-12-5-9-14(10-6-12)16(17)18/h3-10H,15H benzenamine, 4-[(4-nitrophenyl)ethynyl]-