A list of the DOIs and refcodes is provided in the Zenodo repository. The tetradentate porphyrinic macrocycle in a square planar Zn complex (CSD refcode: ODIPIC) also appears in an octahedral complex (refcode: ODINUM), suggesting that its axial ligands are removable, which would allow for the formation of a reactive active site. This macrocycle has been studied for its supramolecular chemistry but has not yet been studied for catalysis. A search of the CSD with the name of the compound ("(5,10,15,20-tetrakis(4-hydroxyphenyl)-2,3,7,8,12,13,17,18-octaphenylporphyrinatozinc(II)") yields no other compounds. Similarly, the use of highly substituted Zn-metalated octaethylporphyrins for their reactivity implies that ligands such as that in ODIPIC may be repurposed as catalyst candidates (Supporting Information Figure ). This octa-functionalized porphyrin ligand has not been crystallized in combination with other metals that may be more catalytically relevant than Zn depending on the reaction, but our earlier analysis suggests that the pocket size would be amenable to other metals. For instance, this pocket size is amenable to supporting Fe, a metal commonly employed for catalysis. The resulting complex may have potential for use as a C-H activation or CO 2 reduction catalyst.