Siemens SMART diffractometer equipped with a Bruker KappaCCD APEXII	4490 independent reflections
Radiation source: fine-focus sealed tube	3600 reflections with I > 2σ(I)
graphite	Rint = 0.034
φ and ω scans	θmax = 28.9°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Bruker, 2001)	h = −19→19
Tmin = 0.383, Tmax = 0.773	k = −22→22
21408 measured reflections	l = −10→10