Demethylcarolignan E is a phenylpropanoid ester that can be isolated from the stems of Hibiscus taiwanensi. Demethylcarolignan E has cytotoxicity against human cancer lines A549 and MCF-7 (IC50: <10 μg/mL)[1].
References
[1] Wu PL, et al. Cytotoxicity of phenylpropanoid esters from the stems of Hibiscus taiwanensis. Bioorg Med Chem. 2004 May 1;12(9):2193-7. DOI:10.1016/j.bmc.2004.02.020