https://w3id.org/framester/conceptnet5/data/en/dimethyl <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/methyl.n> <https://w3id.org/framester/conceptnet5/schema/Synonym> <https://w3id.org/framester/conceptnet5/data/en/ethane> risorse dalla linked data cloud