ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
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°].
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100006260
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