About: http://webisa.webdatacommons.org/42999594

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	R.sub.4 is a hydrogen or halogen atom, or a phenyl, lower alkyl, lower alkoxyl, halo-lower alkyl, nitro or carboxylic ester group; or R.sub.3 and R.sub.4 together form the residue of a benzene ring;
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com