1. Marine
Drugs Research Center, College of Pharmacy, Jinan University, 601 Huangpu Avenue West, Guangzhou 510632, P. R. China
2. Institute
of Organic Chemistry, University of Würzburg, Am Hubland, Würzburg D-97074, Germany
3. Government Degree College at Amadala valasa, Srikakulam District, Andhra Pradesh 532185, India