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Figure 1
The mol­ecular structures of (a) the dianion in (I)[link] and (b) the trianion in (II)[link], showing the atom-numbering schemes and the intra­molecular N—H⋯O hydrogen bond in (I)[link] (dashed line). Displacement ellipsoids are drawn at the 50% probability level.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 6| May 2009| Pages o261-o266
doi:10.1107/S0108270109010683
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