Bruker SMART CCD area-detector diffractometer	2551 independent reflections
Radiation source: fine-focus sealed tube	1782 reflections with I > 2σ(I)
graphite	Rint = 0.066
φ and ω scans	θmax = 26.0°, θmin = 2.0°
Absorption correction: multi-scan (SADABS; Sheldrick, 2001)	h = −30→11
Tmin = 0.834, Tmax = 0.876	k = −30→29
20222 measured reflections	l = −21→20