Rigaku AFC-7R diffractometer	Rint = 0.014
ω–2θ scans	θmax = 27.5°
Absorption correction: ψ scan (North et al., 1968)	h = −4→8
Tmin = 0.432, Tmax = 0.751	k = −8→8
2519 measured reflections	l = −13→13
2050 independent reflections	3 standard reflections every 150 reflections
1989 reflections with F2 > 2σ(F2)	intensity decay: −1.8%