About: http://webisa.webdatacommons.org/38473465

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	The ammonium salts may be formed of unsubstituted ammonium ions, but preferably at least one of R2, R3, R4 and R5 is other than hydrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com