1. Department
of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
2. Departamento
de Química, Universidad Técnica Particular de Loja, Loja, Ecuador
3. Department
of Chemistry, University of Arkansas at Little Rock, Little Rock, Arkansas 72205, United States
4. Division
of Hematology/Oncology, Department of Medicine, Weill Cornell Medical College, New York, New York 10065, United States
5. Instituto
de Química, Universidad Nacional Autónoma de México, México DF, México