Preliminary test and antioxidant activity of the Coptosapelta flavescens Korth’s root extractTri Nhut Pham, Tien Dung Le, Van Tuyen Nguyen, Trong Doan Phan, Duc Quang Thach and Van Khang TranE3S Web Conf., 332 (2021) 07002DOI: https://doi.org/10.1051/e3sconf/202133207002