Nonius MACH-3 diffractometer	1206 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.019
graphite	θmax = 25.0°, θmin = 2.1°
ω–2θ scans	h = −1→8
Absorption correction: ψ scan (North et al., 1968)	k = −8→9
Tmin = 0.935, Tmax = 0.952	l = −11→11
2209 measured reflections	2 standard reflections every 60 min
1743 independent reflections	intensity decay: none