About: http://webisa.webdatacommons.org/378256380

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 a preferred embodiment, at least one of R4, R5 and R6 is an alkyl group containing from 1 to about 4 carbon atoms, such as a methyl group, ethyl group, propyl group, isopropyl group or butyl group.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com