Frontiers in Natural Product Chemistry is a book series devoted to publishing monographs that highlight important advances in natural product chemistry. The series covers all aspects of research in the chemistry and biochemistry of naturally occurring compounds, including research on natural substances derived from plants, microbes and animals. Reviews of structure elucidation, biological activity, organic and experimental synthesis of natural products as well as developments of new methods are also included in the series. The fourth volume of the series brings seven reviews covering these topics: -natural antiamoebic medicines, analgesics and antimalarials-essential oils and cognitive performance-cannabis and drug development -lectins in biosensors, -brassinosteroids.