About: http://webisa.webdatacommons.org/56487616

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	Y is an oxygen or sulphur atom, a direct bond, a methylene, cis or trans vinylene or sulphinyl radical or a radical of the formula NR4 in which R4 is a hydrogen atom or an alkyl radical of 1 to 6 carbon atoms;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com