assertion  retraction  graph  subject          predicate        object                    datatype    annotation
1          0           graph  obo:CHEBI_36688  rdfs:label       heterotricyclic compound  xsd:string  
1          0           graph  obo:CHEBI_36688  oio:id           CHEBI:36688               xsd:string  
1          0           graph  obo:CHEBI_36688  rdfs:subClassOf  obo:CHEBI_33671           _IRI        
1          0           graph  obo:CHEBI_36688  rdf:type         owl:Class                 _IRI