assertion  retraction  graph  subject          predicate        object                    datatype    annotation
1          0           graph  obo:CHEBI_53556  rdfs:label       toluene 2,4-diisocyanate  xsd:string  
1          0           graph  obo:CHEBI_53556  oio:id           CHEBI:53556               xsd:string  
1          0           graph  obo:CHEBI_53556  rdfs:subClassOf  obo:CHEBI_53555           _IRI        
1          0           graph  obo:CHEBI_53556  rdf:type         owl:Class                 _IRI