<http://webisa.webdatacommons.org/371269991> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/371269991> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.es> . <http://webisa.webdatacommons.org/prov/464017595> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/371269991> . <http://webisa.webdatacommons.org/371269991> <http://www.w3.org/ns/prov#value> "With particular preference, R1 is an alkylene group, in particular a C2-C8 alkylene group." .