[1] Natl Res Ctr, Chem Nat & Microbial Prod Dept, Pharmaceut Ind Res Div, El Buhouth St, Giza 12311, Egypt
[2] Mycorrhizal Syst Ltd, Hebden Bridge PR25 2SD, Lancs, England
[3] Univ Stirling, Stirling FK9 4LA, Scotland
[4] Guizhou Univ, Engn Res Ctr Southwest Biopharmaceut Resources, Minist Educ, Guiyang, Guizhou, Peoples R China