About: http://webisa.webdatacommons.org/232759418

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	toms??? with the proviso that when R3 is a methyl group, both R1 and R2 do not represent methyl groups, or
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com