About: http://webisa.webdatacommons.org/144461261

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	Preferably, R5 and R6 are an alkyl groups having 2 or 3 carbon atoms such as ethyl, n-propyl or iso-propyl.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca