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    <!-- http://purl.obolibrary.org/obo/CHEBI_16199 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_16199">
        <rdfs:label>urea</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_29347"/>
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        <oboInOwl:hasDbXref>KNApSAcK:C00007314</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>YMDB:YMDB00003</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>MetaCyc:UREA</oboInOwl:hasDbXref>
        <ns5:inchi>InChI=1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)</ns5:inchi>
        <oboInOwl:hasDbXref>Reaxys:635724</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:46379</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>UM-BBD_compID:c0165</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>HMDB:HMDB0000294</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PPDB:1728</oboInOwl:hasDbXref>
        <ns5:monoisotopicmass>60.03236</ns5:monoisotopicmass>
        <oboInOwl:hasRelatedSynonym>uree</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>Carbamide</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>E927b</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>Wikipedia:Urea</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:9888</oboInOwl:hasAlternativeId>
        <oboInOwl:hasRelatedSynonym>Karbamid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>ur</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasAlternativeId>CHEBI:15292</oboInOwl:hasAlternativeId>
        <oboInOwl:hasRelatedSynonym>carbamide</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>Harnstoff</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasExactSynonym>urea</oboInOwl:hasExactSynonym>
        <ns5:mass>60.05534</ns5:mass>
        <ns5:formula>CH4N2O</ns5:formula>
        <oboInOwl:hasAlternativeId>CHEBI:27218</oboInOwl:hasAlternativeId>
        <oboInOwl:hasExactSynonym>UREA</oboInOwl:hasExactSynonym>
        <oboInOwl:hasDbXref>Beilstein:635724</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>ECMDB:ECMDB04172</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>CAS:57-13-6</oboInOwl:hasDbXref>
        <ns5:inchikey>XSQUKJJJFZCRTK-UHFFFAOYSA-N</ns5:inchikey>
        <oboInOwl:hasDbXref>Drug_Central:4264</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>KEGG:C00086</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>KEGG:D00023</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>Gmelin:1378</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>carbonyldiamide</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:18037357</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>DrugBank:DB03904</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PDBeChem:URE</oboInOwl:hasDbXref>
        <ns3:IAO_0000115>A carbonyl group with two C-bound amine groups. The commercially available fertilizer has an analysis of 46-0-0 (N-P2O5-K2O).</ns3:IAO_0000115>
        <oboInOwl:hasExactSynonym>Urea</oboInOwl:hasExactSynonym>
        <oboInOwl:hasRelatedSynonym>1728</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasOBONamespace>chebi_ontology</oboInOwl:hasOBONamespace>
        <oboInOwl:id>CHEBI:16199</oboInOwl:id>
        <ns5:smiles>NC(N)=O</ns5:smiles>
        <oboInOwl:hasRelatedSynonym>H2NC(O)NH2</oboInOwl:hasRelatedSynonym>
        <oboInOwl:inSubset rdf:resource="http://purl.oboInOwllibrary.org/oboInOwl/chebi#3_STAR"/>
        <ns3:IAO_0000412 rdf:resource="http://purl.obolibrary.org/obo/chebi.owl"/>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_28976 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_28976">
        <rdfs:label>carbonic acid</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_29347 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_29347">
        <rdfs:label>monocarboxylic acid amide</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_33287 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_33287">
        <rdfs:label>fertilizer</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_48376 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_48376">
        <rdfs:label>carbamimidic acid</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_64577 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_64577">
        <rdfs:label>flour treatment agent</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>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_75771 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_75771">
        <rdfs:label>mouse metabolite</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_75772 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_75772">
        <rdfs:label>Saccharomyces cerevisiae metabolite</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_76971 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_76971">
        <rdfs:label>Escherichia coli metabolite</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_77746 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_77746">
        <rdfs:label>human metabolite</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_83056 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_83056">
        <rdfs:label>Daphnia magna metabolite</rdfs:label>
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