About: http://webisa.webdatacommons.org/323492287

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	R3 is hydrogen or lower alkyl; R4 is an unsubstituted or substituted alkyl radical containing from 1 to 21 carbon atoms, or an unsubstituted or substituted aryl radical containing from 6 to 10 carbon atoms; R5 is hydrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca