1. Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu 613401, India
2. Department
of Pharmaceutical Chemistry, University of Vienna, Althanstrasse
14, A-1090 Vienna, Austria
3. Departamento
de Química Orgánica y Farmacéutica, Facultad
de Farmacia, Universidad Complutense, 28040 Madrid, Spain