About: http://webisa.webdatacommons.org/360212443

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	In preferred compounds, a is 2, R3 is a substituted or unsubstituted phenyl group, R4 is hydrogen, and R5 is a divalent bridging group such as an alkylene or phenylene group.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com