(E) -4-Dimethylamino-N-methylstilbazolium iodide

(E) -4-Dimethylamino-N-methylstilbazolium iodide (Py-NMe2) is a styryl dye used as a fluorescent and circular dichroism probe for detecting double-stranded DNA and RNA. With absorption/emission maxima at 450 nm and 615 nm, it is applied in biophysical studies and in vitro nucleic acid sensing assays.