assertion  retraction  graph  subject          predicate        object                            datatype    annotation
1          0           graph  obo:CHEBI_26979  rdfs:label       organic heterotricyclic compound  xsd:string  
1          0           graph  obo:CHEBI_26979  oio:id           CHEBI:26979                       xsd:string  
1          0           graph  obo:CHEBI_26979  rdfs:subClassOf  obo:CHEBI_51959                   _IRI        
1          0           graph  obo:CHEBI_26979  rdfs:subClassOf  obo:CHEBI_38166                   _IRI        
1          0           graph  obo:CHEBI_26979  rdfs:subClassOf  obo:CHEBI_36688                   _IRI        
1          0           graph  obo:CHEBI_26979  rdf:type         owl:Class                         _IRI