assertion  retraction  graph  subject          predicate        object            datatype    annotation
1          0           graph  obo:CHEBI_33704  rdfs:label       alpha-amino acid  xsd:string  
1          0           graph  obo:CHEBI_33704  oio:id           CHEBI:33704       xsd:string  
1          0           graph  obo:CHEBI_33704  rdfs:subClassOf  obo:CHEBI_33709   _IRI        
1          0           graph  obo:CHEBI_33704  rdf:type         owl:Class         _IRI