assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_35618  rdfs:subClassOf  obo:CHEBI_25698  _IRI      
1          0           graph  obo:CHEBI_36816  rdfs:subClassOf  obo:CHEBI_25698  _IRI      
1          0           graph  obo:CHEBI_37407  rdfs:subClassOf  obo:CHEBI_25698  _IRI