Bruker APEXII diffractometer	1781 reflections with I > 2σ(I)
graphite	Rint = 0.025
CCD rotation images, thin slices scans	θmax = 27.5°, θmin = 3.2°
Absorption correction: multi-scan (SADABS; Sheldrick, 2002)	h = −11→7
Tmin = 0.898, Tmax = 0.987	k = −6→6
7993 measured reflections	l = −28→28
2004 independent reflections