assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_59999  rdfs:subClassOf  obo:CHEBI_24431  _IRI      
1          0           graph  obo:CHEBI_23367  rdfs:subClassOf  obo:CHEBI_24431  _IRI      
1          0           graph  obo:CHEBI_24433  rdfs:subClassOf  obo:CHEBI_24431  _IRI      
1          0           graph  obo:CHEBI_33250  rdfs:subClassOf  obo:CHEBI_24431  _IRI