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http://classyfire.wishartlab.com/tax_nodes/C0000000
http://classyfire.wishartlab.com/tax_nodes/C0000012
http://classyfire.wishartlab.com/tax_nodes/C0000259
http://classyfire.wishartlab.com/tax_nodes/C0001606
http://classyfire.wishartlab.com/tax_nodes/C0001606
http://classyfire.wishartlab.com/tax_nodes/C0001551
http://classyfire.wishartlab.com/tax_nodes/C0001334
http://classyfire.wishartlab.com/tax_nodes/C0000286
http://classyfire.wishartlab.com/tax_nodes/C0004150
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:17336
http://www.genome.jp/dbget-bin/www_bget?cpd:C00473
http://www.lipidmaps.org/data/LMSDRecord.php?LMID=LMPR01090000
http://www.hmdb.ca/metabolites/HMDB0000305
http://www.genome.jp/dbget-bin/www_bget?drug:D00069
http://www.genome.jp/dbget-bin/www_bget?cpd:C17276
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=445354
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508191
https://www.chemspider.com/Chemical-Structure.393012.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=50092056
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=11246
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=17336
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL986
https://zinc.docking.org/substances/ZINC000003831417
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DNC001498
http://www.pharmgkb.org/drug/PA451884
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/RTL
http://www.rxlist.com/cgi/generic2/aquasola.htm
https://www.drugs.com/mtm/vitamin-a.html
http://www.pdrhealth.com/drug_info/nmdrugprofiles/nutsupdrugs/vit_0260.shtml
https://en.wikipedia.org/wiki/Vitamin_A