About: http://webisa.webdatacommons.org/357499490

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	Most often, R4 is either hydrogen or a lower alkyl or (especially) lower aryl radical which may contain substituents such as hydroxy, carboxy and carbalkoxy (the carbalkoxy radical usually being COOR5).
http://www.w3.org/ns/prov#wasQuotedFrom	google.es