Chemical identities were first confirmed by cross-referencing identified chemical names against the PubChem database 50 using the pubchempy python library (). From this, a unique identifier for each individual chemical was generated, enabling extraction of key information about each chemical and summation of identical chemicals together. To prevent semantically identical reagents from being considered separately (e.g. zinc nitrate and their hydrates), PubChem identifiers were supplemented with structural information gathered from the cheminformatics tool RDkit. Specifically, chemicals whose formulae contained the elements zinc or cobalt, as well as the nitrate, acetate, sulfate, and imidazole substructures were separately identified.