1. Department of Chemistry; University of Calcutta; 92, A. P. C. Road Kolkata - 700009 India
2. Departament de Quı'mica; Universitat de les IllesBalears; Crta. deValldemossa km 7.5 07122 Palma de Mallorca, Baleares Spain.
3. Molecular & Human Genetics Division; CSIR-Indian Institute of Chemical Biology; 4 Raja S.C. Mallick Road Kolkata- 700032 India