Bruker Kappa APEXII CCD diffractometer	3174 independent reflections
Radiation source: fine-focus sealed tube	2372 reflections with I > 2σ(I)
graphite	Rint = 0.034
φ and ω scans	θmax = 28.3°, θmin = 1.4°
Absorption correction: multi-scan (SADABS; Bruker, 2007)	h = −10→11
Tmin = 0.918, Tmax = 0.972	k = −7→6
7864 measured reflections	l = −20→20