Bruker APEXII CCD area-detector diffractometer	1298 independent reflections
Radiation source: fine-focus sealed tube	1009 reflections with I > 2σ(I)
graphite	Rint = 0.019
φ and ω scans	θmax = 25.5°, θmin = 2.5°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −22→22
Tmin = 0.966, Tmax = 0.979	k = −9→9
5102 measured reflections	l = −13→13