Enraf–Nonius CAD-4 diffractometer	1790 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.004
graphite	θmax = 25.4°, θmin = 2.4°
ω/2θ scans	h = −17→10
Absorption correction: for a sphere (WinGX; Farrugia, 1999)	k = −2→14
Tmin = 0.893, Tmax = 0.906	l = −11→20
4003 measured reflections	3 standard reflections every 200 reflections
2877 independent reflections	intensity decay: 0.9%