1. Department of ChemistryUniversity of Calcutta 92, A.P.C. Road Kolkata India
2. Department of ChemistryJadavpur University Raja S. C. Mallick Road Kolkata 700032 India
3. Department of Theoretical Chemistry, Faculty of ChemistryJagiellonian University Gronostajowa 2 30-387 Krakow Poland
4. Molecular & Human Genetics DivisionCSIR-Indian Institute of Chemical Biology 4 Raja S.C. Mallick Road Kolkata 700032 India