Chrysophanol- and nepodin-8-O-β-D-glucopyranoside from Rumex acetosella, the cytotoxicity towards drug sensitive and multi- drug resistant T leukaemia cancer cells - Ozenver, N; Saeed, M; Guvenalp, Z; Demirezer, LO; Efferth, T (Planta Medica, 2016)