1. Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
2. Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
3. Department of Chemistry, The University of California at Davis, Davis, California 95616, United States
4. Departments of Pharmaceutical Sciences and Chemistry, The University of California at Irvine, Irvine, California 92617, United States