assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_35627  rdfs:label       beta-lactam      xsd:string  
1          0           graph  obo:CHEBI_35627  oio:id           CHEBI:35627      xsd:string  
1          0           graph  obo:CHEBI_35627  rdfs:subClassOf  obo:CHEBI_24995  _IRI        
1          0           graph  obo:CHEBI_35627  rdf:type         owl:Class        _IRI