Natural products are small molecules produced naturally by any organism including primary and secondary metabolites. They include very small molecules, such as urea, and complex structures, such as Taxol. As they may only be isolable in small quantities, have interesting biological activity and chemical structures, natural product synthesis poses an interesting challenge in organic chemistry. Natural products are the origin of the most complex and absorbing chemical structures and it represents natural biological activity, whether as individual compounds or as complex mixtures. Natural Products journal covers the fields of Herbal Medicine, Organic Chemistry and Pharmaceutical Science.