Bruker APEXII DUO CCD area-detector diffractometer	3990 independent reflections
Radiation source: fine-focus sealed tube	2813 reflections with I > 2σ(I)
graphite	Rint = 0.041
φ and ω scans	θmax = 30.2°, θmin = 1.6°
Absorption correction: multi-scan (SADABS; Bruker, 2009)	h = −19→19
Tmin = 0.913, Tmax = 0.985	k = −14→14
21164 measured reflections	l = −14→14