About: http://webisa.webdatacommons.org/197763575

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	R4 is an ionic group selected from those having the structures: ##STR5## wherein:
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr