Selegiline is the levorotatory enantiomer of the racemic mixture deprenyl. Very few studies compare individual enantiomers with racemic lipoic acid. It is a racemic mixture of enantiomers. They can be sold as one enantiomer or as a racemic mixture. In some jurisdictions, single-enantiomer drugs are separately patentable from the racemic mixture. The following table lists pharmaceuticals that have been available in both racemic and single-enantiomer form. Halothane is a chiral molecule that is used as a racemic mixture. This method involves preparing the compound in racemic form, and separating it into its isomers. Enantiomeric chromatographic methods are available to distinguish esomeprazole from racemic omeprazole. Ibuprofen is administered as a racemic mixture. Salbutamol is sold as a racemic mixture. Pemoline is synthesized by the condensation of racemic ethyl mandelate with guanidine. Common salts of racemic synephrine are its hydrochloride, CHNO.HCl, m.p. Esketamine is approximately twice as potent as an anesthetic as racemic ketamine. Hydrolysis into isoborneol followed by oxidation gives racemic camphor.