Siemens SMART CCD area-detector diffractometer	2530 independent reflections
Radiation source: fine-focus sealed tube	1784 reflections with I > 2σ(I)
graphite	Rint = 0.049
φ and ω scans	θmax = 26.0°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Sheldrick 2002)	h = −12→12
Tmin = 0.819, Tmax = 0.847	k = −13→9
7528 measured reflections	l = −15→15