About: http://webisa.webdatacommons.org/320133121

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	Examples of such olefins include alkenes such as propylene, 1-butene, isobutylene, 1-pentene, etc., and alkadienes such as 1,3-butadiene, 2-halomethyl-1,3-butadiene, isoprene and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com