Bruker APEXII CCD diffractometer	3435 independent reflections
Radiation source: fine-focus sealed tube	3272 reflections with I > 2σ(I)
graphite	Rint = 0.037
ω and φ scans	θmax = 45.7°, θmin = 5.4°
Absorption correction: multi-scan (SADABS; Bruker, 2008)	h = −21→21
Tmin = 0.179, Tmax = 0.274	k = −20→21
41355 measured reflections	l = −17→17