assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_51958  rdfs:subClassOf  obo:CHEBI_33832  _IRI      
1          0           graph  obo:CHEBI_33659  rdfs:subClassOf  obo:CHEBI_33832  _IRI      
1          0           graph  obo:CHEBI_33598  rdfs:subClassOf  obo:CHEBI_33832  _IRI      
1          0           graph  obo:CHEBI_24532  rdfs:subClassOf  obo:CHEBI_33832  _IRI