1. Sardar Patel UniversityDepartment of ChemistryUniversity Campus Vallabh Vidyanagr- 388 120 Gujarat India
2. BioLabInstituto Universitario de Bio-Orgánica Antonio GonzálezCIBICANUniversidad de La Laguna Avda. Astrofísico Francisco Sánchez 2 38206 La Laguna Spain.
3. Present address: BioLabInstituto Universitario de Bio-Orgánica Antonio González, CIBICAN, Universidad de La Laguna Avda. Astrofísico Francisco Sánchez 2 38206 La Laguna Spain
4. Department of ChemistryIndian Institute of Technology Madras India.
5. Present address: Department of ChemistrySardar Patel University, University Campus, Vallabh Vidyanagar 388 120 Gujarat India