Combinatorial microbial transformation of natural antiviral drugs Analysis on current situation of compound Chinese materia medica patent entried into China Study on anticancer activity and correlation with meridian tropism of toxic Chinese materia medica Analysis on current situation of compound Chinese materia medica patent entried into China Advanced in solubilization methods of water-insoluble natural drugs Analysis of patent policy for natural drugs abroad and its revelation of Chinese materia medica protection in China