2-(4-(dimethylamino)styryl)-1-methylpyridinium 2-(p-(Dimethylamino)styryl)-1-methylpyridinium iodide 2156-29-8 2M2PM A-7 D 308 (dye) DASPI EINECS 218-460-8 NSC 10517 Pyridinium, 2-(p-(dimethylamino)styryl)-1-methyl-. iodide