assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_33304  rdfs:subClassOf  obo:CHEBI_33675  _IRI      
1          0           graph  obo:CHEBI_33302  rdfs:subClassOf  obo:CHEBI_33675  _IRI      
1          0           graph  obo:CHEBI_33582  rdfs:subClassOf  obo:CHEBI_33675  _IRI      
1          0           graph  obo:CHEBI_24471  rdfs:subClassOf  obo:CHEBI_33675  _IRI