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WikiPedia: Kolekalsiferol http://www.drugbank.ca/drugs/DB00169 http://www.chemspider.com/Chemical-Structure.44443... http://www.mercksource.com/pp/us/cns/cns_hl_dorlan... http://chemapps.stolaf.edu/jmol/jmol.php?model=O%5... http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=... http://pubchem.ncbi.nlm.nih.gov/summary/summary.cg... http://webbook.nist.gov/cgi/cbook.cgi?ID=C67970 http://www.whocc.no/atc_ddd_index/?code=A11CC05 http://www.commonchemistry.org/ChemicalDetail.aspx... http://www.reproduction-online.org/content/144/2/1...