About: http://webisa.webdatacommons.org/267942870

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	R1 is a hydrogen atom, a chlorine atom, an alkyl group of 1 to 4 carbon atoms, such as the methyl group, or an alkoxy group of 1 to 4 carbon atoms, such as a methoxy group, but preferably a hydrogen atom;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com