About: http://webisa.webdatacommons.org/181873746

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 in particular is hydrogen or alkyl of about 1 to 4 carbons, such as methyl, ethyl and iso-propyl.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com