About: http://webisa.webdatacommons.org/391407550

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	Of the compounds represented by formulae (I) and (II), those in which R is a hydrogen atom or a methyl group, R1 is an ethylene group; and n is 0 or 1 are preferred.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com