assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_33256  rdfs:label       primary amide    xsd:string  
1          0           graph  obo:CHEBI_33256  oio:id           CHEBI:33256      xsd:string  
1          0           graph  obo:CHEBI_33256  rdfs:subClassOf  obo:CHEBI_32988  _IRI        
1          0           graph  obo:CHEBI_33256  rdf:type         owl:Class        _IRI