Abstract
Crystals of the title compound, C18H20N4O4, contain equal numbers of (R,R) and (S,S) molecules, but these are not precise enantiomorphs, neither are they related by crystallographic symmetry; in addition, each molecule exhibits approximate, but not exact, twofold rotational symmetry. There are intramolecular N—H⋯O hydrogen bonds [N⋯O 2.609 (4)–2.638 (5) Å; N—H⋯O 125–132°] and the molecules are linked into molecular ladders by C—H⋯O hydrogen bonds [C⋯O 3.306 (6)–3.386 (6) Å; C—H⋯O 146–160°].
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