{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "schema:ChemicalSubstance",
  "title": "ChemicalSubstance",
  "description": "A chemical substance is 'a portion of matter of constant composition, composed of molecular entities of the same type or of different types' (source: [ChEBI:59999](https://www.ebi.ac.uk/chebi/searchId.do?chebiId=59999)).",
  "type": "object",
  "allOf": [
    {
      "description": "Any biological, chemical, or biochemical thing. For example: a protein; a gene; a chemical; a synthetic chemical.",
      "$ref": "schema:BioChemEntity"
    }
  ],
  "properties": {
    "chemicalComposition": {
      "description": "The chemical composition describes the identity and relative ratio of the chemical elements that make up the substance.",
      "type": "string"
    },
    "chemicalRole": {
      "description": "A role played by the BioChemEntity within a chemical context.",
      "oneOf": [
        { "$ref": "schema:DefinedTerm" },
        { "type": "array", "items": { "$ref": "schema:DefinedTerm" } }
      ]
    },
    "potentialUse": {
      "description": "Intended use of the BioChemEntity by humans.",
      "oneOf": [
        { "$ref": "schema:DefinedTerm" },
        { "type": "array", "items": { "$ref": "schema:DefinedTerm" } }
      ]
    }
  }
}