assertion  retraction  graph  subject          predicate        object                      datatype    annotation
1          0           graph  obo:CHEBI_53578  rdfs:label       hexamethylene diisocyanate  xsd:string  
1          0           graph  obo:CHEBI_53578  oio:id           CHEBI:53578                 xsd:string  
1          0           graph  obo:CHEBI_53578  rdfs:subClassOf  obo:CHEBI_53213             _IRI        
1          0           graph  obo:CHEBI_53578  rdf:type         owl:Class                   _IRI