<http://webisa.webdatacommons.org/187732887> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/prov/140621075> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/187732887> . <http://webisa.webdatacommons.org/187732887> <http://www.w3.org/ns/prov#value> "where Rb is a hydrogen or a C1 to C6 alkyl, and n is 0 or 1;" . <http://webisa.webdatacommons.org/187732887> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> .