assertion  retraction  graph  subject          predicate        object                 datatype    annotation
1          0           graph  obo:CHEBI_24921  rdfs:label       isoquinoline alkaloid  xsd:string  
1          0           graph  obo:CHEBI_24921  oio:id           CHEBI:24921            xsd:string  
1          0           graph  obo:CHEBI_24921  rdfs:subClassOf  obo:CHEBI_22315        _IRI        
1          0           graph  obo:CHEBI_24921  rdf:type         owl:Class              _IRI