Bruker SMART APEX CCD diffractometer	2741 independent reflections
Radiation source: fine-focus sealed tube	2512 reflections with I > 2σ(I)
graphite	Rint = 0.026
φ and ω scans	θmax = 27.0°, θmin = 2.5°
Absorption correction: multi-scan (SADABS; Bruker, 1997)	h = −21→21
Tmin = 0.692, Tmax = 0.834	k = −6→11
7147 measured reflections	l = −21→21