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Introduction Alkaloids are the most diverse group of secondary metabolites and over 5000 compounds are known. They are most commonly encountered in the plant kingdom, but representatives have been isolated from most other orders of organisms ranging from fungi to mammals. For years, there has been interest in their pharmacological activities, and for a long time selected plant products (containing alkaloids) have been used as poisons for hunting, murder, euthanasia, a euphoriants, psychedelics, and stimulants (e.g. morphine and cocaine) or as medicines (e.g. ephedrine). Many of our modern drugs now contain the same compound or synthetic analogues, and the pharmacological and toxicological properties of these compounds are thus of immense interest and importance. Almost two centuries have elapsed since Serturner isolated the first organic base clearly recognised as such, a crystalline substance that he obtained from the opium poppy, Papaver somniferum, and called morphine. The name alkaloid is applied to...

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