2h

https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:5818
http://www.hmdb.ca/metabolites/HMDB0014697
http://www.genome.jp/dbget-bin/www_bget?drug:D08054
http://www.genome.jp/dbget-bin/www_bget?cpd:C07045
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3658
https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46508556
https://www.chemspider.com/Chemical-Structure.3531.html
http://www.bindingdb.org/bind/chemsearch/marvin/MolStructure.jsp?monomerid=22875
https://mor.nlm.nih.gov/RxNav/search?searchBy=RXCUI&searchTerm=5553
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=5818
https://www.ebi.ac.uk/chembldb/index.php/compound/inspect/CHEMBL896
http://bidd.nus.edu.sg/group/cjttd/ZFTTDDRUG.asp?ID=DAP000324
http://www.pharmgkb.org/drug/PA449943
http://www.rxlist.com/cgi/generic/hydrox.htm
https://www.drugs.com/hydroxyzine.html
http://www.pdrhealth.com/drug_info/rxdrugprofiles/drugs/ata1035.shtml
https://en.wikipedia.org/wiki/Hydroxyzine