About: http://webisa.webdatacommons.org/361387287

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	The radical R can originate from either a compound having a reactive double bond (scheme 1) or from a thiol (scheme 2) when R3 and A are other than hydrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca