@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/morphine_derivatives>
  skos:prefLabel "morphine derivatives"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/morphine>
  skos:prefLabel "morphine"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/narcotics>
  skos:prefLabel "narcotics"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/heroin>
  skos:prefLabel "heroin"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/controlled_drugs>
  skos:prefLabel "controlled drugs"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/opium>
  skos:prefLabel "opium"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/concepts>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/oxycodone>
  skos:prefLabel "oxycodone"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/opiates> .

<https://concepts.sagepub.com/social-science/concept/opiates>
  skos:narrower <https://concepts.sagepub.com/social-science/concept/oxycodone>, <https://concepts.sagepub.com/social-science/concept/opium>, <https://concepts.sagepub.com/social-science/concept/morphine_derivatives>, <https://concepts.sagepub.com/social-science/concept/morphine>, <https://concepts.sagepub.com/social-science/concept/heroin> ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/narcotics>, <https://concepts.sagepub.com/social-science/concept/controlled_drugs> ;
  skos:prefLabel "opiates"@en ;
  a skos:Concept .