Enraf–Nonius CAD-4 diffractometer	1795 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.054
graphite	θmax = 64.9°, θmin = 3.1°
2θ scan	h = 0→15
Absorption correction: ψ scan (North et al., 1968)	k = 0→4
Tmin = 0.852, Tmax = 0.997	l = −33→33
2593 measured reflections	2 standard reflections every 3600 min
2491 independent reflections	intensity decay: none