@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/stimulating_drugs>
  skos:prefLabel "stimulating drugs"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/nervous_system_stimulants> .

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

<https://concepts.sagepub.com/social-science/concept/nervous_system_drugs>
  skos:prefLabel "nervous system drugs"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/nervous_system_stimulants> .

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

<https://concepts.sagepub.com/social-science/concept/nervous_system_stimulants>
  skos:narrower <https://concepts.sagepub.com/social-science/concept/nicotine>, <https://concepts.sagepub.com/social-science/concept/cocaine>, <https://concepts.sagepub.com/social-science/concept/caffeine>, <https://concepts.sagepub.com/social-science/concept/amphetamines> ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/stimulating_drugs>, <https://concepts.sagepub.com/social-science/concept/nervous_system_drugs> ;
  skos:prefLabel "nervous system stimulants"@en ;
  a skos:Concept .

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

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

<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/nervous_system_stimulants> .