Bruker SMART CCD area-detector diffractometer	3595 independent reflections
Radiation source: fine-focus sealed tube	2424 reflections with I > 2σ(I)
graphite	Rint = 0.063
φ and ω scans	θmax = 25.5°, θmin = 1.8°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −18→20
Tmin = 0.925, Tmax = 0.965	k = −11→11
27428 measured reflections	l = −28→28