assertion  retraction  graph  subject           predicate        object            datatype    annotation
1          0           graph  obo:CHEBI_474859  rdfs:label       maleic anhydride  xsd:string  
1          0           graph  obo:CHEBI_474859  oio:id           CHEBI:474859      xsd:string  
1          0           graph  obo:CHEBI_474859  rdfs:subClassOf  obo:CHEBI_36609   _IRI        
1          0           graph  obo:CHEBI_474859  rdfs:subClassOf  obo:CHEBI_24129   _IRI        
1          0           graph  obo:CHEBI_474859  rdf:type         owl:Class         _IRI