About: http://webisa.webdatacommons.org/446903226

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	???SR, ???SO2R, or ???SOR where R is an alkyl group or an aryl groups and more specifically where R is methyl, ethyl, propyl, butyl, phenyl groups all of which are optionally substituted; for ???SR, R can be hydrogen;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com