assertion  retraction  graph  subject          predicate        object           datatype    annotation
1          0           graph  obo:CHEBI_22221  rdfs:label       acyl group       xsd:string  
1          0           graph  obo:CHEBI_22221  oio:id           CHEBI:22221      xsd:string  
1          0           graph  obo:CHEBI_22221  rdfs:subClassOf  obo:CHEBI_33247  _IRI        
1          0           graph  obo:CHEBI_22221  rdf:type         owl:Class        _IRI