assertion  retraction  graph  subject          predicate        object                 datatype    annotation
1          0           graph  obo:CHEBI_33261  rdfs:label       organosulfur compound  xsd:string  
1          0           graph  obo:CHEBI_33261  oio:id           CHEBI:33261            xsd:string  
1          0           graph  obo:CHEBI_33261  rdfs:subClassOf  obo:CHEBI_36962        _IRI        
1          0           graph  obo:CHEBI_33261  rdfs:subClassOf  obo:CHEBI_26835        _IRI        
1          0           graph  obo:CHEBI_33261  rdf:type         owl:Class              _IRI