B5H7, a Morpholine Derivative of 23-Hydroxybetulinic Acid, Reverses Doxorubicin Resistance in HepG2/ADM. Journal of Cancer Research Updates, [S. l.], v. 3, n. 1, p.  59–66, 2014. DOI: 10.6000/1929-2279.2014.03.01.6. Disponível em: https://www.neoplasiaresearch.com/index.php/jcru/article/view/550. Acesso em: 21 apr. 2026.