Bruker SMART APEXII CCD area-detector diffractometer	3870 independent reflections
Radiation source: fine-focus sealed tube	2240 reflections with I > 2σ(I)
graphite	Rint = 0.026
φ and ω scans	θmax = 31.6°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −13→13
Tmin = 0.944, Tmax = 0.990	k = −15→16
14482 measured reflections	l = −17→17