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Figure 2
1: R = phenyl; 2: R = 2-pyridyl; 3: R = 3-pyridyl; 4: R = 4-pyridyl, a: X = —HN—NH—, b: X = —HN—(CH2)2—NH, c: X = —HN—(CH2)4—NH—; d: X = —HN—(CH2)6—NH—.

IUCrJ
Volume 2| Part 5| September 2015| Pages 523-533
ISSN: 2052-2525
https://doi.org/10.1107/S2052252515009987