About: http://webisa.webdatacommons.org/358701018

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	X1 and X2 may be the same or different from each other, and are a hydrogen atom, a halogen at
http://www.w3.org/ns/prov#wasQuotedFrom	google.com