assertion  retraction  graph  subject          predicate        object           datatype  annotation
1          0           graph  obo:CHEBI_50695  rdfs:subClassOf  obo:CHEBI_27933  _IRI      
1          0           graph  obo:CHEBI_88225  rdfs:subClassOf  obo:CHEBI_27933  _IRI      
1          0           graph  obo:CHEBI_46633  rdfs:subClassOf  obo:CHEBI_27933  _IRI      
1          0           graph  obo:CHEBI_35992  rdfs:subClassOf  obo:CHEBI_27933  _IRI      
1          0           graph  obo:CHEBI_38311  rdfs:subClassOf  obo:CHEBI_27933  _IRI