About: http://webisa.webdatacommons.org/226774118

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	R4 is a radical defined the same as R3, but it may or may not be identical to R3, e.g., R3 =methyl and R4 =propyl; when Z is sulfur R4 is not present;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com