(-)-Chloropseudoephedrine hydrochloride is a chiral organic compound serving as a key intermediate in synthetic chemistry, particularly for the preparation of pharmaceutical agents and research compounds. It is derived from pseudoephedrine by chlorination of the benzylic alcohol group, resulting in a chloromethyl functionality. This reagent is utilized in laboratory settings for the synthesis of ephedrine-like structures and other beta-adrenergic agonists or antagonists. Due to its potential for misuse in the production of controlled substances, it is subject to strict regulatory controls in many countries. It is not directly used as a pharmaceutical active ingredient in medications.