Enraf–Nonius CAD-4 diffractometer	1292 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.031
graphite	θmax = 25.3°, θmin = 2.0°
ω/2θ scans	h = 0→7
Absorption correction: ψ scan (North et al., 1968)	k = −7→8
Tmin = 0.969, Tmax = 0.990	l = −12→12
1756 measured reflections	3 standard reflections every 120 min
1606 independent reflections	intensity decay: 1%