<http://webisa.webdatacommons.org/concept/_presence_of+nitrogen>	<http://webisa.webdatacommons.org/ontology#hasHead>	"presence" .
<http://webisa.webdatacommons.org/concept/_presence_of+nitrogen>	<http://www.w3.org/2000/01/rdf-schema#label>	"presence of nitrogen" .
<http://webisa.webdatacommons.org/concept/_presence_of+nitrogen>	<http://webisa.webdatacommons.org/ontology#hasPostModifier>	"of nitrogen" .