title: Problems involved in structure determination of active principles of plants used in traditional medicine: extraction, separation and determination of characteristics of active principles.
mesh_terms: D002188:Cannabis / Q000032:analysis*; D008519:Medicine, Traditional; D010207:Papaver / Q000032:analysis*; D010598:Pharmacognosy; D008517:Phytotherapy; D010936:Plant Extracts / Q000302:isolation & purification*; D010946:Plants, Medicinal
chemical_list: D010936:Plant Extracts