4.2.1.43 - 4.2.1.43 crystallized at 18°C using the hanging-drop vapour-diffusion method. The crystal diffracts to 2.0 A resolution using synchrotron radiation and belongs to the trigonal space group P3(1)2(1) or its enantiomorph P3(2)2(1), with unit-cell parameters a = b = 78.91, c = 207.71 A