Acknowledgments
The authors TB and VS would like to acknowledge the CSIR, New Delhi, India for providing financial support [Project ref. No. 03(1314)/14/EMR II dt.16-04-14]. The authors gratefully acknowledge the scientific supports extended by Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology Madras, India. ST and MJP would like to thank Laboratorio Nacional de Supercomputo del Sureste (LNS-BUAP, Mexico) for computational resources.
Keywords: lysine . mandelic acid . QTAIM . PIXEL . Hirshfeld surface