{ "items" : [
    { "id" : "http://caligraph.org/ontology/Iron(III)_compound"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#subClassOf" : [ "http://caligraph.org/ontology/Iron_compound" ] } },

    { "id" : "http://caligraph.org/ontology/Iron(II)_compound"
      "properties" : {
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    { "id" : "http://caligraph.org/ontology/Iron_compound"
      "properties" : {
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        "http://www.w3.org/2000/01/rdf-schema#label" : [ "Iron compound" ] ,
        "http://www.w3.org/2000/01/rdf-schema#subClassOf" : [ "http://caligraph.org/ontology/Chemical_compound" ] ,
        "http://www.w3.org/ns/prov#wasDerivedFrom" : [ "http://en.wikipedia.org/wiki/Category:Iron_compounds" ] } },

    { "id" : "http://caligraph.org/ontology/Iron_complex"
      "properties" : {
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    { "id" : "http://caligraph.org/ontology/Iron(0)_compound"
      "properties" : {
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    { "id" : "http://caligraph.org/ontology/Iron(II,III)_compound"
      "properties" : {
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