1. Medicinal and Process Chemistry Division; CSIR - Central Drug Research Institute; Lucknow 226 031 India
2. Division of Sophisticated Analytical Instrument Facility; CSIR - Central Drug Research Institute; Lucknow 226 031 India
3. Academy of Scientific and Innovative Research; New Delhi 110001 India
4. National Centre for Mass Spectrometry; CSIR - Indian Institute of Chemical Technology; Hyderabad 500 007 India