assertion  retraction  graph  subject          predicate        object              datatype    annotation
1          0           graph  obo:CHEBI_33241  rdfs:label       oxoacid derivative  xsd:string  
1          0           graph  obo:CHEBI_33241  oio:id           CHEBI:33241         xsd:string  
1          0           graph  obo:CHEBI_33241  rdfs:subClassOf  obo:CHEBI_37577     _IRI        
1          0           graph  obo:CHEBI_33241  rdf:type         owl:Class           _IRI