Mode of action of amatoxins—2. Close involvement of the 6′-hydroxyle of the indole in the hepatotoxic process: D. Michelot,1A. M. Zheleva2 and Z. D. Zhelev3 (1Laboratoire de Chimie du Muséum Nationale d'Histoire Naturelle (URA 401 du CNRS), 63 rue Buffon, 75005 Paris, France; 2Department of Chemistry and Biochemistry and 3Department of Molecular Biology and Immunology, Medical University, 6003, Stara Zagora, Bulgaria)