C2O4= C2O4=
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The oxalate anion has 3 mutually perpendicular mirror planes, 3 twofold rotation axes, and a point of inversion.

The point-group symmetry for this molecule is given the crystallographic symbol 2/m 2/m 2/m, which is usually shortened to m m m.

© Copyright 1997-2006.  Birkbeck College, University of London. Author(s): Jeremy Karl Cockcroft