title: The preparation of O-methylporphyroxine and its detection in opium.
mesh_terms: D000470:Alkaloids; D000478:Alkylation; D002626:Chemistry, Pharmaceutical; D002855:Chromatography, Thin Layer; D009892:Opium; D013057:Spectrum Analysis
chemical_list: D000470:Alkaloids; D009892:Opium