Pharmaceutical Sciences Research Division, BCSIR Laboratories, Dhaka, Bangladesh;
Institute of National Analytical Research and Service (INARS), BCSIR, Dhaka, Bangladesh;
Pilot Plant & Process Development Center (PP & PDC), BCSIR, Dhaka, Bangladesh;
Department of Biology & Chemistry, North South University, Dhaka, Bangladesh;
Piper; nigrum; L; NMR; Spectroscopy; X-Ray; Diffraction; Studies; Bulk; Piperine;