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    <!-- http://purl.obolibrary.org/obo/CHEBI_18421 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_18421">
        <rdfs:label>superoxide</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_33263"/>
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        <oboInOwl:hasDbXref>PMID:10440226</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>FooDB:FDB022880</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:28842347</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>Wikipedia:Superoxide</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:23542447</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:14529453</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:32144830</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>O2(.-)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:26475962</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>superoxide radical anion</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:15586010</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:22759590</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:22247596</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:30307099</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:14703794</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:8959373</oboInOwl:hasDbXref>
        <ns4:formula>O2</ns4:formula>
        <oboInOwl:hasDbXref>PMID:17052238</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>O2.-</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>superoxido</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:15807660</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>superoxyde</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PDBeChem:2FK</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:22198225</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:17303648</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:33248264</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:19914407</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:28341974</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:29669742</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:29259135</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:19273321</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>Dioxid(1-)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:21297912</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:20868230</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:12097818</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:24567847</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:28825637</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:21473702</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>Superoxide anion</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>CAS:11062-77-4</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:21434856</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:2160451</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:24862271</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:23668959</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:22521482</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:12137408</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:7998676</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>hyperoxide</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:30573187</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:2552230</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>O2-</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>Hyperoxid</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasExactSynonym>dioxide(.1-)</oboInOwl:hasExactSynonym>
        <oboInOwl:hasDbXref>PMID:23660153</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:8720916</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>(O2)(.-)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>KEGG:C00704</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:29896077</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:27066025</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:26839</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>PMID:26047895</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:15143</oboInOwl:hasAlternativeId>
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        <oboInOwl:hasDbXref>PMID:33716500</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11333112</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>Gmelin:487</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:14726604</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:19482633</oboInOwl:hasDbXref>
        <oboInOwl:hasOBONamespace>chebi_ontology</oboInOwl:hasOBONamespace>
        <oboInOwl:hasDbXref>PMID:32220789</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:217531</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>dioxide(1-)</oboInOwl:hasRelatedSynonym>
        <ns4:monoisotopicmass>31.98983</ns4:monoisotopicmass>
        <oboInOwl:hasDbXref>PMID:17531522</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:18827931</oboInOwl:hasDbXref>
        <oboInOwl:id>CHEBI:18421</oboInOwl:id>
        <oboInOwl:hasDbXref>PMID:33805942</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>superoxide radical</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:29385710</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:28842493</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:1671684</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:27085844</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:8577306</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:31484901</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:9337481</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:32760286</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>O2(-)</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:34635271</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:28599858</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>HMDB:HMDB0002168</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:32667121</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:12598407</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:16814528</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:27590268</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:32478084</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:16771675</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>hiperoxido</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:31254369</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:19857607</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:26875845</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:18519744</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:32927603</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:30500433</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:11008114</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>superoxide anion radical</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>PMID:22729857</oboInOwl:hasDbXref>
        <ns4:charge>-1</ns4:charge>
        <oboInOwl:hasDbXref>Chemspider:4514331</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>MetaCyc:SUPER-OXIDE</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:27066179</oboInOwl:hasDbXref>
        <oboInOwl:hasExactSynonym>superoxide</oboInOwl:hasExactSynonym>
        <oboInOwl:hasDbXref>PMID:11485972</oboInOwl:hasDbXref>
        <ns4:inchikey>OUUQCZGPVNCOIJ-UHFFFAOYSA-M</ns4:inchikey>
        <oboInOwl:hasDbXref>PMID:30886134</oboInOwl:hasDbXref>
        <ns4:mass>31.999</ns4:mass>
        <oboInOwl:hasDbXref>PMID:27357008</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>PMID:10523323</oboInOwl:hasDbXref>
        <ns4:inchi>InChI=1S/HO2/c1-2/h1H/p-1</ns4:inchi>
        <oboInOwl:hasDbXref>PMID:27965593</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:7710</oboInOwl:hasAlternativeId>
        <ns4:smiles>[O][O-]</ns4:smiles>
        <oboInOwl:hasDbXref>PMID:15952898</oboInOwl:hasDbXref>
        <oboInOwl:hasExactSynonym>dioxidanidyl</oboInOwl:hasExactSynonym>
        <oboInOwl:hasDbXref>PMID:10588368</oboInOwl:hasDbXref>
        <oboInOwl:inSubset rdf:resource="http://purl.obolibrary.org/obo/chebi#3_STAR"/>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_33263 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_33263">
        <rdfs:label>diatomic oxygen</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_36876 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_36876">
        <rdfs:label>inorganic radical anion</rdfs:label>
    </Class>
    


    <!-- http://purl.obolibrary.org/obo/CHEBI_61073 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_61073">
        <rdfs:label>oxygen radical</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_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>
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