assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_36181  rdfs:label       succinate ester  xsd:string  
1          0           graph  obo:CHEBI_36181  oio:id           CHEBI:36181      xsd:string  
1          0           graph  obo:CHEBI_36181  rdfs:subClassOf  obo:CHEBI_33308  _IRI        
1          0           graph  obo:CHEBI_36181  rdf:type         owl:Class        _IRI