Table 1. Data-collection statistics.

Values in parentheses are for the outermost resolution shell.

Crystal	Form I	Form II
Wavelength (Å)	0.97799	0.97800
Space group	P21212	P212121
Unit-cell parameters (Å)	a = 26.3, b = 144.3, c = 61.5	a = 26.2, b = 121.3, c = 142.7
Resolution limits (Å)	50.0–2.45 (2.54–2.45)	50.0–2.70 (2.80–2.70)
Observations	57202	69252
Unique reflections	9119	13423
Completeness (%)	98.2 (81.6)	99.4 (99.5)
Average I/σ(I)	8.8 (3.9)	6.2 (3.3)
Average redundancy	6.3 (4.6)	5.1 (5.0)
Rsym†	0.119 (0.424)	0.131 (0.505)

^† R _sym = , where I _i is the ith measurement and 〈I(h)〉 is the weighted mean of all measurements of I(h).