Nonius KappaCCD diffractometer	3608 independent reflections
Radiation source: fine-focus sealed tube	3030 reflections with I > 2σ(I)
graphite	Rint = 0.020
Detector resolution: 18 pixels mm-1	θmax = 27.5°, θmin = 1.5°
ω scans at fixed χ = 55°	h = −20→20
Absorption correction: multi-scan (SCALEPACK; Otwinowski & Minor, 1997)	k = −9→9
Tmin = 0.946, Tmax = 0.972	l = −20→20
6895 measured reflections