assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_37533  rdfs:label       azo compound     xsd:string  
1          0           graph  obo:CHEBI_37533  oio:id           CHEBI:37533      xsd:string  
1          0           graph  obo:CHEBI_37533  rdfs:subClassOf  obo:CHEBI_51143  _IRI        
1          0           graph  obo:CHEBI_37533  rdf:type         owl:Class        _IRI