Enraf–Nonius CAD-4 diffractometer	178 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.125
graphite	θmax = 34.8°, θmin = 2.5°
θ/2θ scans	h = −5→5
Absorption correction: numerical (SHELXTL; Sheldrick, 2008)	k = −5→5
Tmin = 0.117, Tmax = 0.718	l = −13→13
1906 measured reflections	3 standard reflections every 120 min
181 independent reflections	intensity decay: none