About: http://webisa.webdatacommons.org/99250795

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	where X is a direct linkage or a divalent group, e.g. --SO2 --, --O-- or ##EQU1## where n is a whole number, preferably 1 to 4, and R1 and R2 are selected from hydrogen atoms and hydrocarbyl, especially alkyl groups.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com