1. Department of Chemistry, Visva-Bharati (A Central University), Santiniketan-731235, India
2. Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation
3. Department of Botany, Visva-Bharati (A Central University), Santiniketan-731235, India
4. Botany Section, Regionlal Ayurveda Research Institute, Gangtok, Sikkim-737102, India
5. I. Ya. Postovskiy Institute of Organic Synthesis, Ural Division of the Russian Academy of Sciences, 22 S. Kovalevskoy Str., Yekaterinburg, 620219, Russian Federation