Cell parameters were retrieved using the CrysAlisPro software 2 and refined using CrysAlisPro The structures were solved using Olex2 3 with the ShelXT 4 structure solution program, using the Intrinsic Phasing solution method. The models were refined with version 2014/7 of ShelXL 5 using Least Squares minimisation. All non-hydrogen atoms were refined anisotropically. Hydrogen atom positions were calculated geometrically and refined using the riding model.