About: http://webisa.webdatacommons.org/438607388

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 R1 is an optional group selected from any one of ???OH, a sulphamate group, a phosphonate group, a thiophosphonate group, a sulphonate group or a sulphonamide group.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com