“Phytochemical Assay and Antioxidant Activity against DPPH of Ethanol Extract from Kenaf Leaf (Hibiscus cannabinus L.)”, J. Trop. Pharm. Chem, vol. 4, no. 5, pp. 203–208, Jun. 2019, doi: 10.30872/j.trop.pharm.chem.v4i5.273.