Received 12 April 2009
Each of the two independent molecules of the title comound, C14H20N2O3, exists in the zwitterionic form as the imino N atoms are protonated. The =N-H unit forms an intramolecular hydrogen bond to the negatively charged O atom, and also a weaker intermolecular N-HO bond, the latter resulting in inversion dimers.
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK2422 ).
The authors thank the University of Malaya for supporting this study.
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Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Westrip, S. P. (2009). publCIF. In preparation.