New derivatives of silybin and 2,3-dehydrosilybin and their cytotoxic and P-glycoprotein modulatory activity - Džubák, P; Hajdúch, M; Gažák, R; Svobodová, A; Psotová, J; Walterová, D; Sedmera, P; Křen, V (Bioorg Med Chem, 2006)