Bruker APEXII CCD area-detector diffractometer	1168 independent reflections
Radiation source: fine-focus sealed tube	1126 reflections with I > 2σ(I)
graphite	Rint = 0.013
φ and ω scans	θmax = 25.1°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −4→4
Tmin = 0.527, Tmax = 0.705	k = −9→11
1761 measured reflections	l = −11→12