Bruker SMART APEXII CCD area-detector diffractometer	5318 independent reflections
Radiation source: fine-focus sealed tube	4128 reflections with I > 2σ(I)
graphite	Rint = 0.032
φ and ω scans	θmax = 30.1°, θmin = 1.4°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −41→41
Tmin = 0.862, Tmax = 0.983	k = −11→11
40913 measured reflections	l = −21→18