https://w3id.org/framester/conceptnet5/data/en/propionic_acid.n <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/carboxylic_acid> <https://w3id.org/framester/conceptnet5/schema/Synonym> <https://w3id.org/framester/conceptnet5/data/en/preservative> <https://w3id.org/framester/conceptnet5/data/en/propanoic_acid> risorse dalla linked data cloud