Structural representation of important anticancer secondary metabolites from plants. The structures are adapted from NCBI cited as National Center for Biotechnology Information. PubChem Database. (a) 2-Methylanthraquinone, Compound identification number (CID) = 6773; (b) albanol A, CID = 44567218; (c) artemisinin, CID = 68827; (d) baicalein, CID = 5281605; (e) berberine, CID = 2353; (f) curcumin, CID = 969516; (g) D-amygdalin, CID = 656516; (h) garcinol, CID = 5281560; (i) oblongifolin A CID = 53364454; (j) oridonin, CID = 5321010; (k) platycodin D, CID = 162859; (l) polyphyllin C, CID = 44429637; (m) scutellarein, CID = 5281697, and (n) triptolide, CID = 107985. (o) isoegomaketone, CID = 5318556; https://pubchem.ncbi.nlm.nih.gov/compound/ (accessed on 18 July 2019).