Initial crystallization and structure determination were performed in Minorlab with data collected in Argonne. Later, a better crystal was used to obtain 1.84 Å diffraction data collected at a temperature of 100 K on the BESSY 14.1 beamline (Helmholtz-Zentrum Berlin, Germany) using a Dectris PILATUS 6M detector. The data set was recorded at a wavelength of 0.9184 Å.