assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_33358  rdfs:subClassOf  obo:CHEBI_33561  _IRI      
1          0           graph  obo:CHEBI_33362  rdfs:subClassOf  obo:CHEBI_33561  _IRI      
1          0           graph  obo:CHEBI_33350  rdfs:subClassOf  obo:CHEBI_33561  _IRI