1-(2,4-dinitrophenyl)pyridinium 4185-69-7 InChI=1/C11H8N3O4/c15-13(16)9-4-5-10(11(8-9)14(17)18)12-6-2-1-3-7-12/h1-8H/q+ pyridinium, 1-(2,4-dinitrophenyl)-