<http://webisa.webdatacommons.org/concept/polynuclear+aromatic+hydrocarbon_pahs_>	<http://webisa.webdatacommons.org/ontology#hasHead>	"pahs" .
<http://webisa.webdatacommons.org/concept/polynuclear+aromatic+hydrocarbon_pahs_>	<http://www.w3.org/2000/01/rdf-schema#label>	"polynuclear aromatic hydrocarbon pahs" .
<http://webisa.webdatacommons.org/concept/polynuclear+aromatic+hydrocarbon_pahs_>	<http://webisa.webdatacommons.org/ontology#hasPreModifier>	"polynuclear aromatic hydrocarbon" .