Bruker SMART APEXII CCD area-detector diffractometer	4715 independent reflections
Radiation source: fine-focus sealed tube	3863 reflections with I > 2σ(I)
graphite	Rint = 0.033
φ and ω scans	θmax = 35.0°, θmin = 1.6°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −20→21
Tmin = 0.962, Tmax = 0.981	k = −10→10
26403 measured reflections	l = −21→21