Bruker Kappa APEXII CCD diffractometer	2844 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.035
graphite	θmax = 28.4°, θmin = 2.0°
ω and φ scan	h = −13→13
16737 measured reflections	k = −27→27
4237 independent reflections	l = −10→10