About: http://webisa.webdatacommons.org/382847559

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	which contains an oxygen or sulfur atom, such as lower alkoxy, lower alkyl thio ether or the like and R' represents hydrogen or a lower alkyl.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com