Bruker APEXII CCD diffractometer	1377 independent reflections
Radiation source: fine-focus sealed tube	1270 reflections with I > 2σ(I)
graphite	Rint = 0.030
φ and ω scans	θmax = 25.0°, θmin = 3.4°
Absorption correction: multi-scan (SADABS; Bruker, 2004)	h = −8→8
Tmin = 0.987, Tmax = 0.991	k = −11→13
6725 measured reflections	l = −33→40