Modified Hederagenin Derivatives Demonstrate Ex Vivo Anthelmintic Activity against <i>Fasciola hepatica</i> oleh Anand Chakroborty, Deiniol R. Pritchard, Marc E. Bouillon, Anna Cervi, Rolf Kraehenbuehl, Charlotte Wild, Caroline Fenn, Peter Holdsworth, Colin Capner, Gilda Padalino, Josephine E. Forde-Thomas, Joseph Payne, Brendan G. Smith, Maggie Fisher, Martina Lahmann, Mark S. Baird, Karl F. Hoffmann