About: http://webisa.webdatacommons.org/222044966

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	Preferably R3 is either hydrogen or a hydrocarbyl group e.g. of 1-20 carbons.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com