Figure 2
The two independent hydrogen-bonded dimers in the structure of (I ), showing (a) that generated by inversion, where atoms marked with an asterisk (*) are at the symmetry position (1 − x, 1 − y, 1 − z), and (b) that generated by rotation, where atoms marked with an asterisk (*) are at the symmetry position (1 − x, y, − z). |