material entity molecular entity molecular entities molekulare Entitaet entidades moleculares molecular entity entite moleculaire molecular entity molecular entity entidad molecular Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity. CHEBI:23367 chebi_ontology We are assuming that every molecular entity has to be completely connected by chemical bonds. This excludes protein complexes, which are comprised of minimally two separate molecular entities. We will follow up with Chebi to ensure this is their understanding as well