Bruker SMART CCD area-detector diffractometer	4142 independent reflections
Radiation source: fine-focus sealed tube	3415 reflections with I > 2σ(I)
graphite	Rint = 0.041
φ and ω scans	θmax = 27.5°, θmin = 2.2°
Absorption correction: multi-scan (SADABS, Sheldrick, 1996)	h = −15→15
Tmin = 0.778, Tmax = 1.000	k = −10→10
24687 measured reflections	l = −25→25