Bruker SMART APEXII CCD area-detector diffractometer	21275 independent reflections
Radiation source: fine-focus sealed tube	16663 reflections with I > 2σ(I)
graphite	Rint = 0.096
φ and ω scans	θmax = 31.1°, θmin = 0.6°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −19→19
Tmin = 0.965, Tmax = 0.985	k = −96→96
173518 measured reflections	l = −21→21