https://w3id.org/framester/conceptnet5/data/en/ethene <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/ene> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/chemical_compound> <https://w3id.org/framester/conceptnet5/data/en/natural_substance> <https://w3id.org/framester/conceptnet5/data/en/unsaturated_hydrocarbon> risorse dalla linked data cloud