About: http://webisa.webdatacommons.org/157892990

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	R3a is hydrogen, alkyl or aryl (especially with the proviso that when R3a is hydrogen, R3 other than methyl);
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com