Bruker APEXII CCD diffractometer	1365 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.073
graphite	θmax = 28.3°, θmin = 3.3°
φ and ω scans	h = −18→22
10325 measured reflections	k = −8→8
2546 independent reflections	l = −16→24