Bruker APEXII CCD area-detector diffractometer	4506 independent reflections
Radiation source: sealed tube	3581 reflections with I > 2σ(I)
graphite	Rint = 0.029
φ and ω scans	θmax = 30.0°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Bruker, 2005)	h = −19→19
Tmin = 0.965, Tmax = 0.991	k = −14→12
19818 measured reflections	l = −31→31