1. Departamento
de Química, Cinvestav, Gustavo A. Madero, 07360 México
2. Department of Chemistry, Stanford University, Stanford, California 94395, United States
3. Max Planck
Laboratory for Structural Biology, Chemistry and Molecular Biophysics
of Rosario (MPLbioR, UNR-MPIbpC) and Instituto de Investigaciones
para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Universidad Nacional de Rosario, Ocampo y Esmeralda, S2002LRK Rosario, Argentina
4. Stanford Synchrotron Radiation Lightsource (SSRL), SLAC, Stanford University, Menlo Park, California 94025, United States