Siemens P4 diffractometer	Rint = 0.045
Graphite monochromator	θmax = 27.5°, θmin = 2.5°
2θ/ω scans	h = −2→9
Absorption correction: ψ scan (North et al., 1968)	k = −4→11
Tmin = 0.646, Tmax = 1	l = −11→33
2937 measured reflections	3 standard reflections every 97 reflections
2126 independent reflections	intensity decay: 1%
1146 reflections with I > 2σ(I)