Crystal parameters, data collection and structure refinement.

aRmerge = ∑hkl∑i|Ii(hkl)- |/∑hkl∑iIi(hkl), where Ii(hkl) is the intensity of an observation and is the mean value for its unique reflection; Summations are over all reflections.bR-factor = ∑h|Fo(h)-Fc(h)|/∑hFo(h), where Fo and Fc are the observed and calculated structure-factor amplitudes, respectively.cR-free was calculated with 5% of the data excluded from the refinement.dRoot-mean square-deviation from ideal values.eCategories were defined by Molprobity.