N-Bromosuccinimide organic reagent CAS 128-08-5 applied in allylic substitution Product Introduction N-Bromosuccinimide, abbreviated as NBS, CAS registry number 128-08-5, belongs to organic brominated reagent. This white to pale yellow crystalline solid carries faint bromine odour. It decomposes under strong light and elevated temperature. The substance dissolves in ethyl acetate while showing limited solubility in water. It acts as controlled source of bromine radical and