Guaifenesin 1 was extracted from plants of the Guiacum genus native to tropical and subtropical American regions. It has been used in treatment of cough, [1a] gout, [1b] fibromyalgia, [1c] and primary dysmenorrhea. [1d] Nowadays, many guaifenesin derivatives [ 2 2. Asymmetris synthesis of guaifenesin and its derivatives: (a) Nelson , WL ; Wennerstrom , JE ; Sankar , SR Absolute configuration of glycerol derivatives. 3. Synthesis and Cupra A circular dichroism spectra ...