assertion  retraction  graph  subject          predicate        object               datatype    annotation
1          0           graph  obo:CHEBI_33635  rdfs:label       polycyclic compound  xsd:string  
1          0           graph  obo:CHEBI_33635  oio:id           CHEBI:33635          xsd:string  
1          0           graph  obo:CHEBI_33635  rdfs:subClassOf  obo:CHEBI_33595      _IRI        
1          0           graph  obo:CHEBI_33635  rdf:type         owl:Class            _IRI