assertion  retraction  graph  subject          predicate        object              datatype    annotation
1          0           graph  obo:CHEBI_36605  rdfs:label       phthalic anhydride  xsd:string  
1          0           graph  obo:CHEBI_36605  oio:id           CHEBI:36605         xsd:string  
1          0           graph  obo:CHEBI_36605  rdfs:subClassOf  obo:CHEBI_38831     _IRI        
1          0           graph  obo:CHEBI_36605  rdfs:subClassOf  obo:CHEBI_36609     _IRI        
1          0           graph  obo:CHEBI_36605  rdf:type         owl:Class           _IRI