assertion  retraction  graph  subject          predicate        object                 datatype    annotation
1          0           graph  obo:CHEBI_36607  rdfs:label       cyclic acid anhydride  xsd:string  
1          0           graph  obo:CHEBI_36607  oio:id           CHEBI:36607            xsd:string  
1          0           graph  obo:CHEBI_36607  rdfs:subClassOf  obo:CHEBI_36606        _IRI        
1          0           graph  obo:CHEBI_36607  rdf:type         owl:Class              _IRI