Bruker APEXII CCD diffractometer	2673 independent reflections
Radiation source: fine-focus sealed tube	2411 reflections with I > 2σ(I)
graphite	Rint = 0.032
φ and ω scans	θmax = 28.3°, θmin = 2.4°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −13→13
Tmin = 0.917, Tmax = 0.940	k = −15→15
17626 measured reflections	l = −13→13