Oxford Diffraction Xcalibur diffractometer	924 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.067
graphite	θmax = 27.5°, θmin = 4.6°
ω scans	h = −7→4
4224 measured reflections	k = −13→13
1692 independent reflections	l = −14→15