The chemical Dansyl chloride has a designated molecular formula of C12H12ClNO2S and a molecular weight of 269.743 g/mol. Synonyms may include: 4-14-00-02801 (Beilstein Handbook Reference), AI3-52455, BRN 2217205, 1-Chlorosulfonyl-5-dimethylaminonaphthalene, Dansyl, Dimethylaminonaphthalenesulfonyl chloride, 1-Dimethylaminonaphthalene-5-sulfonyl chloride, 5-Dimethylaminonaphthalene-1-sulfonyl chloride, 5-Dimethylaminonaphthyl-5-sulfonyl chloride, DNS chloride (ChemID).