https://w3id.org/framester/conceptnet5/data/en/polyethylene_terephthalate <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/ethylene.n> <https://w3id.org/framester/conceptnet5/data/en/terephthalate.n> <https://w3id.org/framester/conceptnet5/data/en/polyethylene.n> <https://w3id.org/framester/conceptnet5/schema/InstanceOf> <https://w3id.org/framester/conceptnet5/data/en/chemical_compound> <https://w3id.org/framester/conceptnet5/data/en/chemical_substance> risorse dalla linked data cloud