Nonius KappaCCD area-detector diffractometer	2484 reflections with I > 2σ(I)
graphite	Rint = 0.042
ω scans	θmax = 27.5°, θmin = 5.1°
Absorption correction: multi-scan (DENZO/SCALEPACK; Otwinowski & Minor, 1997)	h = −10→10
Tmin = 0.20, Tmax = 0.41	k = −11→11
2675 measured reflections	l = −20→20
2658 independent reflections