assertion  retraction  graph  subject          predicate        object            datatype    annotation
1          0           graph  obo:CHEBI_51402  rdfs:label       phenylenediamine  xsd:string  
1          0           graph  obo:CHEBI_51402  oio:id           CHEBI:51402       xsd:string  
1          0           graph  obo:CHEBI_51402  rdfs:subClassOf  obo:CHEBI_35410   _IRI        
1          0           graph  obo:CHEBI_51402  rdfs:subClassOf  obo:CHEBI_33860   _IRI        
1          0           graph  obo:CHEBI_51402  rdf:type         owl:Class         _IRI