Description Diphenyl Diselenide, 99%, 25g For Research & Development Not for drug, clinical use in humans, for food or food additive use Certificate of Analysis: Appearance (Color) Yellow Appearance (Form) Powder Purity (GC Area %) 99% Infrared Spectrum Conforms to structure CAS: 1666-13-3 FORMULA: C6H5SeSeC6H5