6BANSKOTA A H ,TEZU KA Y,PRASAIN J K,et al . Chemical constituents of Brazilian propolis and their cytotoxic activites [J] . Nat Prod ,1998,61:896-900.
7BANKOVA V ,MARCUCCI M C ,SIMOVA S ,et al. Antibacterial diterpenic acids from Brazilian propolis [J]. Z Naturforsch , 1996,51:277-280.