Table 3. Data collection and processing.

Diffraction source	BL17U, SSRF
Wavelength (Å)	0.9793
Temperature (K)	100
Detector	CCD
Crystal-to-detector distance (mm)	250
Rotation range per image (°)	1
Total rotation range (°)	220
Exposure time per image (s)	1
Space group	C2221
a, b, c (Å)	50.99, 204.02, 211.85
α, β, γ (°)	90, 90, 90
Mosaicity (°)	0.44
Resolution range (Å)	50.0–2.10 (2.14–2.10)
Total No. of reflections	354295 (64847)
No. of unique reflections	64417 (11580)
Completeness (%)	98.9 (100)
Multiplicity	5.5 (5.6)
〈I/σ(I)〉	17.82 (4.68)
R r.i.m.	0.085 (0.415)
Overall B factor from Wilson plot (Å2)	24.2