About: http://webisa.webdatacommons.org/57078440

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.sup.4 is a hydrogen atom or an alkyl radical, in particular having 1 to 4 carbon atoms, preferably a hydrogen atom.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com