About: http://webisa.webdatacommons.org/55973299

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	During the formation of petroleum the heterofunctional groups originally being present in the natural material, especially the nitrogen, sulfur, and oxygen hetero-functional groups must have been eliminated from these substances.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au