Bruker APEXII CCD diffractometer	3767 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.028
graphite	θmax = 25.0°, θmin = 1.6°
φ and ω scans	h = −17→17
28459 measured reflections	k = −12→12
4419 independent reflections	l = −23→22