assertion  retraction  graph  subject          predicate        object                    datatype    annotation
1          0           graph  obo:CHEBI_33552  rdfs:label       sulfonic acid derivative  xsd:string  
1          0           graph  obo:CHEBI_33552  oio:id           CHEBI:33552               xsd:string  
1          0           graph  obo:CHEBI_33552  rdfs:subClassOf  obo:CHEBI_33424           _IRI        
1          0           graph  obo:CHEBI_33552  rdf:type         owl:Class                 _IRI