Duc Thien Dao, Quoc Thang Le and Thanh Tam Nguyen 2022. Nitrogen-containing heterocyclic compounds from the roots of Callerya speciosa. Vietnam Journal of Science, Technology and Engineering. 64, 3 (Sep. 2022), 49-52. DOI:https://doi.org/10.31276/VJSTE.64(3).49-52.