Bruker SMART APEXII CCD area-detector diffractometer	3859 independent reflections
Radiation source: fine-focus sealed tube	3302 reflections with I > 2σ(I)
graphite	Rint = 0.057
φ and ω scans	θmax = 30.2°, θmin = 2.4°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −22→22
Tmin = 0.858, Tmax = 0.979	k = −6→6
26528 measured reflections	l = −20→23