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2821767 
Journal Article 
rac-Ammonium cis-2-carb-oxy-cyclo-hexane-1-carboxyl-ate 
Smith, G; Wermuth, UD 
2010 
Yes 
Acta Crystallographica. Section E: Structure Reports Online
ISSN: 1600-5368 
67 
Pt 1 
o174 
English 
21522680 
In the structure of the title compound, NH(4) (+)·C(8)H(11)O(4) (-), the carboxyl and carboxyl-ate groups of the cation adopt C-C-C-O torsion angles of 174.9 (2) and -145.4 (2)°, respectively, with the alicyclic ring. The ammonium H atoms of the cations give a total of five hydrogen-bonding associations with carboxyl-ate O-atom acceptors of the anion which, together with a carboxyl O-H⋯O(carboxyl-ate) inter-action give sheet structures which lie in the (101) planes.