About: http://webisa.webdatacommons.org/404480129

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	: M2Sr???(3) wherein M is an alkali metal and r is a positive number of 1 to 4 on average, and optionally a halogen-containing compound of the general formula (4): X???R4???X???(4) wherein R4 and X are as defined above and/or sulfur. 2.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com