assertion  retraction  graph  subject          predicate        object                     datatype    annotation
1          0           graph  obo:CHEBI_33671  rdfs:label       heteropolycyclic compound  xsd:string  
1          0           graph  obo:CHEBI_33671  oio:id           CHEBI:33671                xsd:string  
1          0           graph  obo:CHEBI_33671  rdfs:subClassOf  obo:CHEBI_5686             _IRI        
1          0           graph  obo:CHEBI_33671  rdfs:subClassOf  obo:CHEBI_33635            _IRI        
1          0           graph  obo:CHEBI_33671  rdf:type         owl:Class                  _IRI