1. Nestlé Research Center, Nestec Ltd., Vers-chez-les-Blanc, 1000 Lausanne 26, Switzerland; INSERM U456, Faculté de Pharmacie, Université de Rennes I, 35043 Rennes, France, Department of Biochemistry and Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, and Division of Chemistry, National Center for Toxicological Research, Jefferson, Arkansas 72079