About: http://webisa.webdatacommons.org/451374753

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	In the group (IX), R9 is preferably a hydrogen atom or a hydrocarbon group, particularly a hydrogen group.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com