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    <!-- http://purl.obolibrary.org/obo/CHEBI_26069 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_26069">
        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">phosphonic acids</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_4907 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_4907">
        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Etidronate</rdfs:label>
        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">etidronic acid</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_26069"/>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(1-Hydroxyethylene)diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(1-Hydroxyethylidene)bis(phosphonic acid)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(1-Hydroxyethylidene)bisphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(1-Hydroxyethylidene)diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasExactSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(1-hydroxyethane-1,1-diyl)bis(phosphonic acid)</oboInOwl:hasExactSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">(Hydroxyethylidene)diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1,1,1-Ethanetriol diphosphonate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxy-1,1-diphosphonoethane</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethane-1,1-bisphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethane-1,1-diphosphonate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethane-1,1-diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethanediphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethylidene-1,1-bisphosphonate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">1-Hydroxyethylidene-1,1-diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <ns4:DRON_00010000 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">42682</ns4:DRON_00010000>
        <ns2:IAO_0000115 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">A phosphonic acid consisting of (ethane-1,1-diyl)bis(phosphonic acid) having a hydroxy substituent at the 1-position. Inhibits formation, growth, and dissolution of hydroxyapatite crystals by chemisorption to calcium phosphate surfaces</ns2:IAO_0000115>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Acetodiphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">C2H8O7P2</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CC(O)(P(O)(O)=O)P(O)(O)=O</oboInOwl:hasRelatedSynonym>
        <oboInOwl:id rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CHEBI:4907</oboInOwl:id>
        <oboInOwl:hasAlternativeId rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CHEBI:63588</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">ChemIDplus:2809-21-4</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CiteXplore:10385693</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CiteXplore:17157266</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CiteXplore:17214981</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CiteXplore:18313802</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">DrugBank:DB01077</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">EHDP</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Ethane-1-hydroxy-1,1-diphosphonate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Ethane-1-hydroxy-1,1-diphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Etidronsaeure</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">HEDP</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Hydroxyethanediphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">InChI=1S/C2H8O7P2/c1-2(3,10(4,5)6)11(7,8)9/h3H,1H3,(H2,4,5,6)(H2,7,8,9)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">InChIKey=DBVJJBKOTRCVKF-UHFFFAOYSA-N</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">KEGG COMPOUND:2809-21-4</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">KEGG COMPOUND:C07736</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">KEGG DRUG:D02373</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Oxyethylidenediphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Patent:US3159581</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Reaxys:1789291</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Wikipedia:Etidronate</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">acide etidronique</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">acido etidronico</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">acidum etidronicum</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">ethane-1-hydroxy-1,1-bisphosphonic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">etidronate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">etidronic acid</oboInOwl:hasRelatedSynonym>
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