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    <!-- http://purl.obolibrary.org/obo/CHEBI_17898 -->

    <Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_17898">
        <rdfs:label>all-trans-retinal</rdfs:label>
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CHEBI_26873"/>
        <ns4:charge rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">0</ns4:charge>
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        <oboInOwl:hasDbXref>foodb.food:FDB030668</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>all-trans-vitamin A aldehyde</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:22417174</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>all-trans-retinal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>chemspider:553582</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22559266</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>kegg.compound:C00376</oboInOwl:hasDbXref>
        <oboInOwl:hasExactSynonym>(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenal</oboInOwl:hasExactSynonym>
        <oboInOwl:hasRelatedSynonym>axerophthal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:32212312</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>vitamin A aldehyde</oboInOwl:hasRelatedSynonym>
        <ns4:smiles_string>[H]C(=O)/C=C(C)/C=C/C=C(C)/C=C/C1=C(C)CCCC1(C)C</ns4:smiles_string>
        <oboInOwl:hasDbXref>pubmed:22621924</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>retinaldehyde</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:15686550</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:22348</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>pubmed:32492112</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22428905</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:33334878</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:21447403</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>wikipedia.en:Retinal</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22162152</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>retinyl aldehyde</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>retinal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:32371567</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:16128572</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22220722</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:26568132</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>all-trans-retinene</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:15500295</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:16054134</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>all-trans-retinaldehyde</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:17326003</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:15724104</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>retinene</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>trans-vitamin A aldehyde</oboInOwl:hasRelatedSynonym>
        <ns4:generalized_empirical_formula>C20H28O</ns4:generalized_empirical_formula>
        <oboInOwl:hasRelatedSynonym>trans-retinal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasRelatedSynonym>E-retinal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>cas:116-31-4</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>vitamin A1 aldehyde</oboInOwl:hasRelatedSynonym>
        <ns3:IAO_0000115>A retinal in which all four exocyclic double bonds have &lt;i&gt;E&lt;/i&gt;- (&lt;i&gt;trans&lt;/i&gt;-) geometry.</ns3:IAO_0000115>
        <oboInOwl:hasDbXref>hmdb:HMDB0001358</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:12776</oboInOwl:hasAlternativeId>
        <oboInOwl:hasDbXref>pubmed:33034385</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>metacyc.compound:RETINAL</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:28780307</oboInOwl:hasDbXref>
        <ns4:inchi_string>InChI=1S/C20H28O/c1-16(8-6-9-17(2)13-15-21)11-12-19-18(3)10-7-14-20(19,4)5/h6,8-9,11-13,15H,7,10,14H2,1-5H3/b9-6+,12-11+,16-8+,17-13+</ns4:inchi_string>
        <oboInOwl:hasDbXref>pubmed:16004575</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>all-E-retinal</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:22198730</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22841964</oboInOwl:hasDbXref>
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        <oboInOwl:hasOBONamespace>chebi_ontology</oboInOwl:hasOBONamespace>
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        <ns4:inchi_key_string>NCYCYZXNIZJOKI-OVSJKPMPSA-N</ns4:inchi_key_string>
        <oboInOwl:hasDbXref>reaxys:1914183</oboInOwl:hasDbXref>
        <oboInOwl:id>CHEBI:17898</oboInOwl:id>
        <oboInOwl:hasDbXref>pubmed:12168520</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pdb-ccd:RET</oboInOwl:hasDbXref>
        <oboInOwl:hasDbXref>pubmed:22515697</oboInOwl:hasDbXref>
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        <oboInOwl:hasDbXref>pubmed:21995425</oboInOwl:hasDbXref>
        <oboInOwl:hasRelatedSynonym>retinene 1</oboInOwl:hasRelatedSynonym>
        <oboInOwl:hasDbXref>pubmed:22431612</oboInOwl:hasDbXref>
        <oboInOwl:hasAlternativeId>CHEBI:8814</oboInOwl:hasAlternativeId>
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        <rdfs:label>terpenoid</rdfs:label>
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