Bruker APEXII CCD diffractometer	1786 independent reflections
Radiation source: fine-focus sealed tube	1313 reflections with I > 2σ(I)
graphite	Rint = 0.040
φ and ω scans	θmax = 28.0°, θmin = 2.0°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −7→7
Tmin = 0.974, Tmax = 0.984	k = −14→16
7948 measured reflections	l = −23→20