Enraf–Nonius CAD-4 diffractometer	2587 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.036
Graphite monochromator	θmax = 25.4°, θmin = 1.6°
ω/2θ scans	h = 0→11
Absorption correction: ψ scan (North et al., 1968)	k = −11→12
Tmin = 0.972, Tmax = 0.991	l = −15→15
4453 measured reflections	3 standard reflections every 200 reflections
4183 independent reflections	intensity decay: 1%