assertion  retraction  graph  subject          predicate        object                datatype    annotation
1          0           graph  obo:CHEBI_51403  rdfs:label       1,4-phenylenediamine  xsd:string  
1          0           graph  obo:CHEBI_51403  oio:id           CHEBI:51403           xsd:string  
1          0           graph  obo:CHEBI_51403  rdfs:subClassOf  obo:CHEBI_51402       _IRI        
1          0           graph  obo:CHEBI_51403  rdf:type         owl:Class             _IRI