1. Department
of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, Michigan 48824, United States
2. Division
of Medicinal Chemistry and Natural Products, UNC Eshelman School of
Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
3. Department
of Chemistry, Beirut Arab University, P.O. Box 11-5020, Riad El Solh 11072809, Beirut, Lebanon