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    <!-- http://purl.obolibrary.org/obo/CHEBI_35221 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_35221">
        <rdfs:label>antimetabolite</rdfs:label>
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    <!-- http://purl.obolibrary.org/obo/CHEBI_35610 -->

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        <rdfs:label>antineoplastic agent</rdfs:label>
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    <!-- http://purl.obolibrary.org/obo/CHEBI_44423 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_44423">
        <rdfs:label>hydroxyurea</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_47857"/>
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        <oboInOwl:hasDbXref>KEGG:C07044</oboInOwl:hasDbXref>
        <ns5:inchikey>VSNHCAURESNICA-UHFFFAOYSA-N</ns5:inchikey>
        <ns5:smiles>NC(=O)NO</ns5:smiles>
        <oboInOwl:hasRelatedSynonym>carbamohydroxamic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasExactSynonym>N-hydroxyurea</oboInOwl:hasExactSynonym>
        <ns5:inchi>InChI=1S/CH4N2O2/c2-1(4)3-5/h5H,(H3,2,3,4)</ns5:inchi>
        <oboInOwl:hasOBONamespace>chebi_ontology</oboInOwl:hasOBONamespace>
        <oboInOwl:hasRelatedSynonym>Hydroxyharnstoff</oboInOwl:hasRelatedSynonym>
        <ns4:IAO_0000115>A member of the class of ureas that is urea in which one of the hydrogens is replaced by a hydroxy group. An antineoplastic used in the treatment of chronic myeloid leukaemia as well as for sickle-cell disease.</ns4:IAO_0000115>
        <oboInOwl:hasDbXref>KEGG:D00341</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>carbamyl hydroxamate</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>DrugBank:DB01005</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>MetaCyc:HYDROXY-UREA</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>CAS:127-07-1</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>hydrea</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>hidroxicarbamida</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>N-carbamoylhydroxylamine</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>N-HYDROXYUREA</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:15772364</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>Drug_Central:1399</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>hydroxycarbamide</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>Reaxys:1741548</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>hydroxycarbamidum</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>Patent:US2705727</oboInOwl:hasDbXref>
        <oboInOwl:id>CHEBI:44423</oboInOwl:id>
        <oboInOwl:hasRelatedSynonym>carbamohydroximic acid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasAlternativeId>CHEBI:44420</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>Beilstein:1741548</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:9271088</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11298103</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:5816</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>PMID:11365149</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11364534</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>Hydroxycarbamide</oboInOwl:hasRelatedSynonym>
        <ns5:monoisotopicmass>76.02728</ns5:monoisotopicmass>
        <ns5:mass>76.05474</ns5:mass>
        <oboInOwl:hasDbXref>HMDB:HMDB0015140</oboInOwl:hasDbXref>
        <ns5:charge>0</ns5:charge>
        <oboInOwl:hasDbXref>PMID:14988684</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11285159</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>Hydroxycarbamid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:23643402</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>oxyurea</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasExactSynonym>hydroxyurea</oboInOwl:hasExactSynonym>
        <ns5:formula>CH4N2O2</ns5:formula>
        <oboInOwl:hasDbXref>Gmelin:130423</oboInOwl:hasDbXref>
        <oboInOwl:hasExactSynonym>Hydroxyurea</oboInOwl:hasExactSynonym>
        <oboInOwl:hasDbXref>PMID:15994344</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>Wikipedia:Hydroxyurea</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11391710</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PDBeChem:NHY</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:22983419</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:23696560</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:23318979</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:16356682</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>carbamoyl oxime</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:12107454</oboInOwl:hasDbXref>
        <oboInOwl:inSubset rdf:resource="http://purl.obolibrary.org/obo/chebi#3_STAR"/>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_47857 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_47857">
        <rdfs:label>ureas</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_48578 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_48578">
        <rdfs:label>radical scavenger</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_50846 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_50846">
        <rdfs:label>immunomodulator</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_50902 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_50902">
        <rdfs:label>genotoxin</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_50905 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_50905">
        <rdfs:label>teratogenic agent</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_59517 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_59517">
        <rdfs:label>DNA synthesis inhibitor</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_64708 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_64708">
        <rdfs:label>one-carbon compound</rdfs:label>
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    <!-- http://purl.obolibrary.org/obo/CHEBI_64911 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_64911">
        <rdfs:label>antimitotic</rdfs:label>
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    <!-- http://purl.obolibrary.org/obo/CHEBI_74213 -->

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        <rdfs:label>EC 1.17.4.1 (ribonucleoside-diphosphate reductase) inhibitor</rdfs:label>
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