About: http://webisa.webdatacommons.org/292306726

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 one embodiment, each of R1, R2, R3, and R4 is a methyl group.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com