assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_24995  rdfs:label       lactam           xsd:string  
1          0           graph  obo:CHEBI_24995  oio:id           CHEBI:24995      xsd:string  
1          0           graph  obo:CHEBI_24995  rdfs:subClassOf  obo:CHEBI_38101  _IRI        
1          0           graph  obo:CHEBI_24995  rdfs:subClassOf  obo:CHEBI_37622  _IRI        
1          0           graph  obo:CHEBI_24995  rdfs:subClassOf  obo:CHEBI_23443  _IRI        
1          0           graph  obo:CHEBI_24995  rdf:type         owl:Class        _IRI