1. Department
of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249, United States
2. Centre
for Biodiversity and Drug Discovery, Institute for Scientific Research and High Technology Services, Panama City, Republic of Panama
3. Department
of Biotechnology, Acharya Nagarjuna University, Nagarjuna Nagar, India
4. Department
of Chemistry, University of Texas-Pan American, Edinburg, Texas 78539, United States