About: http://webisa.webdatacommons.org/50304272

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	wherein R is hydrogen, or an alkyl group containing 1 to 4 carbon atoms such as a methyl or ethyl group, and R' is an alkyl group containing from 1 to about 6 carbon atoms.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au