Harsono, A.; Rahman, A.; Putri, R. J.; Tjahjandarie, T. S.; Saputri, R. D.; Ahmat, N.; Tanjung, M. Isolation of Lignans from The Stem Bark of Willughbeia Coriacea and Their Cytotoxic Activity: Http: .www.doi.org 10.26538 Tjnpr V7i2.14. TJNPR 2023, 7, 2394-2396.