@prefix dukems: . @prefix skos: . @prefix wd: . dukems:13 a skos:Concept ; skos:note "Chemical Abstracts Service (CAS) Registry Number 118-74-1" ; skos:exactMatch wd:Q409682, ; skos:altLabel "HCB" ; skos:broader dukems:16 ; skos:prefLabel "Hexachlorobenzene"@en . dukems:16 skos:prefLabel "Pollutant"@en ; a skos:Concept ; skos:narrower dukems:13 .