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Figure 3 A view of the C—H⋯π stacking inter­actions between CH groups of 2-hydroxy­propane-1,2,3-tricarboxylic acid with the aromatic rings of 4,4′-bipyridine: H⋯π distance of 2.634 Å for C2—O2A⋯Cg3 (−1 + x, y, z) [Cg3 is the centroid of ring N3/C17–C21].

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 65| Part 3| February 2009| Pages o532-o533
doi:10.1107/S1600536809004607
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