About: http://webisa.webdatacommons.org/245342137

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	R.sub.1 is a hydrogen atom or a methyl group, and X is an oxygen atom or a sulfur atom.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com