New Natural Products and Plant Drugs with Pharmacological, Biological or Therapeutical Activity

The fact that, of the approximately 600,000 plant species existing on the earth, only some 5 % have been specifically investigated chemically or pharmacologi­ cally, is a challenge to chemists spezializing in na­ tural substances and to pharmacologists. In view of the limited number of research capacities and the ever­ diminishing financial means, this challenge can only be met if, together with an improvement and refinement of methods of analysis, medicinal plant research is carried out on a br