Bruker SMART CCD diffractometer	3863 independent reflections
Radiation source: fine-focus sealed tube	2284 reflections with I > 2σ(I)
graphite	Rint = 0.052
ω scans	θmax = 27.5°, θmin = 2.6°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −15→26
Tmin = 0.429, Tmax = 0.473	k = −10→16
7060 measured reflections	l = −9→9