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WikiPedia: Butana http://www.chemadvisor.com/Matheson/database/msds/... http://www.chemspider.com/Chemical-Structure.7555.... http://chemapps.stolaf.edu/jmol/jmol.php?model=CCC... http://www.cdc.gov/niosh/npg/npgd0068.html http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=... http://pubchem.ncbi.nlm.nih.gov/summary/summary.cg... http://www.nlm.nih.gov/cgi/mesh/2007/MB_cgi?mode=&... http://www.kegg.jp/entry/D03186 http://www.commonchemistry.org/ChemicalDetail.aspx... //doi.org/10.1021%2Fie50363a016