assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_50893  rdfs:label       azaarene         xsd:string  
1          0           graph  obo:CHEBI_50893  oio:id           CHEBI:50893      xsd:string  
1          0           graph  obo:CHEBI_50893  rdfs:subClassOf  obo:CHEBI_38101  _IRI        
1          0           graph  obo:CHEBI_50893  rdfs:subClassOf  obo:CHEBI_33833  _IRI        
1          0           graph  obo:CHEBI_50893  rdf:type         owl:Class        _IRI