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) Angstrom; N-H ... O 125-132 degrees] and the molecules are linked into molecular ladders by C-H ... O hydrogen bonds [C ... O 3.306 (6)-3.386 (6) Angstrom; C-H ... O 146-160 degrees].
Original language | English |
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Pages (from-to) | 865-867 |
Number of pages | 3 |
Journal | Acta Crystallographica Section C-Crystal Structure Communications |
Volume | 56 |
Publication status | Published - Jul 2000 |