Compounds containing this functional group can be dimerized by reacting with sodium plumbite in alkaline conditions. Several compounds containing two adjacent instances of this functional group are used to treat arsenic and lead poisoning by chelation. This functional (15[1])group turns a solution yellow in a test using DTNB, or Ellman’s reagent. A carbonyl is reduced to a methylene by reacting with a compound containing two of this functional group in the (*) Mozingo reduction. Because this functional group strongly bonds to mercury, it is also called (10[1])“mercaptan.” This functional group is responsible for unpleasant smells (10[1])including the odorant in natural gas and skunk spray. The only amino acid that contains this functional group is cysteine, allowing two of them to form a disulfide bond. For 10 points, name this functional group, the sulfur analogue of an alcohol. ■END■