assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_4027   rdfs:subClassOf  obo:CHEBI_36683  _IRI      
1          0           graph  obo:CHEBI_28876  rdfs:subClassOf  obo:CHEBI_36683  _IRI      
1          0           graph  obo:CHEBI_2674   rdfs:subClassOf  obo:CHEBI_36683  _IRI      
1          0           graph  obo:CHEBI_23132  rdfs:subClassOf  obo:CHEBI_36683  _IRI