Bruker APEXII CCD area-detector diffractometer	1921 independent reflections
Radiation source: fine-focus sealed tube	1774 reflections with I > 2σ(I)
graphite	Rint = 0.015
φ and ω scans	θmax = 25.5°, θmin = 2.8°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −7→7
Tmin = 0.640, Tmax = 0.865	k = −9→9
6428 measured reflections	l = −23→24