Bruker SMART APEXII CCD area-detector diffractometer	2557 independent reflections
Radiation source: fine-focus sealed tube	2131 reflections with I > 2σ(I)
graphite	Rint = 0.040
φ and ω scans	θmax = 28.3°, θmin = 2.6°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −17→16
Tmin = 0.794, Tmax = 0.927	k = −21→21
17468 measured reflections	l = −13→13