About: http://webisa.webdatacommons.org/418349780

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	X3 represents a hydroxy group or a nucleophilic leaving group such as a halogen atom, e.g. a chlorine, bromine or iodine atom, and
http://www.w3.org/ns/prov#wasQuotedFrom	google.com