Abbasi. K, Khuhawar M, Bhanger M. Ethyl Chloroformate as Derivatizing Reagent for Gas Chromatographic Determination of Norephedrine, Ephedrine and Pseudoephedrine in Pharmaceutical Preparation. ajc [Internet]. 2010 Mar. 30 [cited 2024 Oct. 3];21(2):1145-54. Available from: https://asianpubs.org/index.php/ajchem/article/view/18802