Enraf–Nonius CAD-4 diffractometer	2121 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.039
Graphite monochromator	θmax = 27.0°, θmin = 2.0°
non–profiled ω/2τ scans	h = −17→17
Absorption correction: ψ scan (North et al., 1968)	k = −19→1
Tmin = 0.423, Tmax = 0.649	l = −11→5
6241 measured reflections	2 standard reflections every 120 min
3707 independent reflections	intensity decay: 6%