The crystals were placed in Hampton Paratone oil, mounted on a MiTeGen loop and plunged into liquid nitrogen to flash freeze. The data were collected at 100 K with Oxford Cryostream. The crystals analyzed at the synchrotron were transported frozen in a Taylor-Wharton CX100 dry shipper. Data collection and reduction for the synchrotron ID-29 data were done using MXCube, and the EDNA automated data processing pipeline with XDS. The structures were solved by direct methods using SHELXT implemented with the Olex2 software GUI. The structures were refined by full-matrix least-squares methods on F 2 with SHELXL. All nonhydrogen atoms were refined with anisotropic displacement coefficients. Hydrogen atoms were placed in calculated positions, assigned isotropic displacement coefficients, U(H) = 1.2U(C) or 1.5U (Cmethyl), and their coordinates were allowed to ride on their respective carbons. .