Ma , Yin-Hai, Yin-Ke Li, Hai-Ying Yang, Yun Dai, and Gan-Peng Li. 2010. “A New Diterpenoid From The Steam of Hibiscus Mutabilis Linn”. Asian Journal of Chemistry 21 (8):6601-3. https://asianpubs.org/index.php/ajchem/article/view/12369.