Hamamelitannin from Witch Hazel (Hamamelis virginiana) Displays Specific Cytotoxic Activity against Colon Cancer Cells. Susana Sánchez-Tena, María L. Fernández-Cachón, Anna Carreras, M. Luisa Mateos-Martín, Noelia Costoya, Mary P. Moyer, María J. Nuñez, Josep L. Torres and Marta Cascante, J. Nat. Prod., Publication Date (Web): January 4, 2012, doi10.1021/np200426k