Ent-Clerodane Diterpenes from the Bark of Croton oligandrus Pierre ex Hutch. and Assessment of Their Cytotoxicity against Human Cancer Cell Lines. - Guetchueng, Stephanie Tamdem; Nahar, Lutfun; Ritchie, Kenneth James; Ismail, Fyaz Mahmood Daud; Evans, Andrew Robert; Sarker, Satyajit Dey (Molecules, 2018)