Bruker SMART APEXII diffractometer	1342 independent reflections
Radiation source: fine-focus sealed tube	1096 reflections with I > 2σ(I)
graphite	Rint = 0.028
φ and ω scans	θmax = 26.4°, θmin = 2.3°
Absorption correction: numerical (SADABS; Sheldrick, 2002)	h = −6→6
Tmin = 0.501, Tmax = 0.851	k = −9→8
4678 measured reflections	l = −19→21