Bruker APEXII CCD diffractometer	3365 independent reflections
Radiation source: sealed tube	3060 reflections with I > 2σ(I)
graphite	Rint = 0.029
φ and ω scans	θmax = 26.0°, θmin = 2.3°
Absorption correction: multi-scan (SADABS; Bruker, 2000)	h = −12→12
Tmin = 0.885, Tmax = 0.988	k = −13→13
20360 measured reflections	l = −19→19