A search of the Cambridge Structural Database (Version 5.37 with two updates, Groom et al., 2016 ▸) returned 1448 entries for crystal structures related to the name pyridine-2,6-di­carboxyl­ato. Most of them are crystal structures of metal complexes. However, there are only four entries with a secondary ligand of a pyrazolyl derivative bonded to a transition metal, viz. a Cu complex (Lin et al., 2009 ▸; Wang et al., 2014 ▸) and Zn and Co complexes (Zhang et al., 2011 ▸).