About: http://webisa.webdatacommons.org/194431232

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	However, preferably, R2 is a hydrogen atom or an alkyl group of up to 4 carbon atoms, e.g., ethyl, propyl, isopropyl, or especially methyl.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au