and mass spectroscopy. This is the first report that G. glabra and L. officinalis have the capability to biotransform α-artemether, and P. quinquefolium to biotransform DHA. Metabolite 3 is a new compound and metabolite 4 is reported here for the first time from artemisinin derivatives 1 and 2. The presence of acetate function in the derivative 3 and hydroxyl and C-12 deoxo groups in 4 obtained in our