Table 1. Data-collection statistics.

Values in parentheses are for the highest resolution shell.

Space group	R3
Radiation source	SER-CAT 22ID, APS
Unit-cell parameters (hexagonal setting) (Å, °)	a = b = 102.5, c = 97.5, α = β = 90.0, γ = 120
Temperature (K)	100
Wavelength (Å)	1.0
Oscillation range (°)	1.0
Crystal-to-detector distance (mm)	200
No. of frames	180
Resolution range (Å)	25.0–2.40 (2.49–2.40)
Total reflections	53779
Unique reflections	14925
Average redundancy	3.6
〈I/σ(I)〉	6.2 (2.8)
Overall B factor (Å2)	68.8
Completeness (%)	99.1 (99.8)
Rmerge† (%)	11.7 (45.0)

^† R _merge = , where 〈I(hkl)〉 is the mean intensity of reflection hkl and I _i(hkl) is the ith measurement of the intensity of reflection hkl.