Enraf–Nonius CAD-4 diffractometer	1875 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.027
Graphite monochromator	θmax = 25.4°, θmin = 1.8°
ω/2θ scans	h = 0→11
Absorption correction: ψ scan (North et al., 1968)	k = −12→10
Tmin = 0.982, Tmax = 0.994	l = −14→14
3652 measured reflections	3 standard reflections every 200 reflections
3420 independent reflections	intensity decay: 1%