(1R,2S)-(-)-Ephedrine, a chiral ß-amino alcohol, is commonly used as a chiral auxiliary in asymmetric synthesis. It undergoes reduction to form (+)-methamphetamine. Synonyms: (-)-Ephedrine; (1R,2S)-(-)-alpha-(1-Methylaminoethyl)benzyl alcohol; (1R,2S)-(-)-2-Methylamino-1-phenyl-1-propanol;…