Bruker SMART APEXII CCD area-detector diffractometer	5420 independent reflections
Radiation source: fine-focus sealed tube	3497 reflections with I > 2σ(I)
graphite	Rint = 0.031
φ and ω scans	θmax = 30.0°, θmin = 1.5°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −11→9
Tmin = 0.902, Tmax = 0.966	k = −12→12
20839 measured reflections	l = −36→38