{"iri":"https://schema.org/ChemicalSubstance","label":"ChemicalSubstance","definition":"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)).","license":"https://creativecommons.org/licenses/by-sa/3.0/","source":"business","source_url":"https://schema.org/"}