1. a Department of Chemistry, Faculty of Science , Prince of Songkla University , Hat Yai , Songkhla 90112 , Thailand
2. b Natural Product Research Center, Faculty of Science , Prince of Songkla University , Hat Yai , Songkhla 90112 , Thailand
3. c Department of Microbiology, Faculty of Science , Prince of Songkla University , Hat Yai , Songkhla 90112 , Thailand
4. d Griffith (Gold Coast Campus), School of Environment Griffith University , Queensland Q4222 , Australia