assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_33958  rdfs:subClassOf  obo:CHEBI_24866  _IRI      
1          0           graph  obo:CHEBI_24868  rdfs:subClassOf  obo:CHEBI_24866  _IRI      
1          0           graph  obo:CHEBI_35479  rdfs:subClassOf  obo:CHEBI_24866  _IRI