1. Department of Chemistry and Chemical TechnologyVidyasagar University Midnapore 721102, West Bengal India
2. Department of Human Physiology with Community HealthVidyasagar University Midnapore 721102, West Bengal India
3. Department of ChemistryDurham University Durham DH13LE U.K.
4. Department of Chemical and Pharmaceutical SciencesUniversity of Trieste 34127 Trieste Italy