125295-40-1 Benzoic acid, 4-(23-((4-nitrophenyl)methyl)-10,15,20-tris(4-sulfophenyl)-21H,23H-porphin-5-yl)- N-4-Nitrobenzyl-5-(4-carboxyphenyl)-10,15,20-tris(4-sulfophenyl)porphine N-Bzhcs3P