Bruker SMART CCD area-detector diffractometer	3069 independent reflections
Radiation source: fine-focus sealed tube	2001 reflections with I > 2σ(I)
graphite	Rint = 0.033
ω scans	θmax = 27.0°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −21→22
Tmin = 0.977, Tmax = 0.980	k = −6→6
8164 measured reflections	l = −17→19