Bruker APEXII CCD diffractometer	2243 independent reflections
Radiation source: fine-focus sealed tube	1862 reflections with I > 2σ(I)
graphite	Rint = 0.019
φ and ω scans	θmax = 25.3°, θmin = 2.4°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −5→5
Tmin = 0.977, Tmax = 0.996	k = −10→10
3432 measured reflections	l = −18→18