Daniel K. Nomura, DNomura@aol.com¹, Kathleen A. Durkin², Kyle P. Chiang³, Gary B. Quistad⁴, Benjamin F. Cravatt, cravatt@scripps.edu³, and John E. Casida, ectl@nature.berkeley⁴. (1) Nutritional Sciences and Toxicology, Molecular Toxicology Graduate Group, University of California, Berkeley, Environmental Chemistry and Toxicology Laboratory, Berkeley, CA 94720-3112, (2) Molecular Graphics Facility, College of Chemistry, University of California, Berkeley, Berkeley, CA 94720-1460, (3) The Skaggs Institute for Chemical Biology and Departments of Chemistry and Cell Biology, The Scripps Research Institute, La Jolla, CA 92037-1000, (4) Department of Environmental Sciences, Policy and Management, University of California, Berkeley, Environmental Chemistry and Toxicology Laboratory, Berkeley, CA 94720-3112