The Chemical Functional Ontology (ChemFOnt) is a hierarchical, OWL-compatible ontology describing the functions and actions of biologically important chemicals including primary metabolites, secondary metabolites, natural products, food chemicals, synthetic food additives, drugs, herbicides, pesticides and environmental chemicals. The identifiers in this semantic space correspond to entries in the ChemFOnt ontology that are used to organize individual chemicals. Terms can be looked up using the following URL (https://www.chemfont.ca/ontology_browse/term_info/18), but not directly by ID