assertion  retraction  graph  subject           predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_33675   rdfs:subClassOf  obo:CHEBI_33579  _IRI      
1          0           graph  obo:CHEBI_33674   rdfs:subClassOf  obo:CHEBI_33579  _IRI      
1          0           graph  obo:CHEBI_138675  rdfs:subClassOf  obo:CHEBI_33579  _IRI