<http://webisa.webdatacommons.org/120840315> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/prov/1184298> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/120840315> . <http://webisa.webdatacommons.org/120840315> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> . <http://webisa.webdatacommons.org/120840315> <http://www.w3.org/ns/prov#value> "In a third aspect, this invention is a composition for the sustained release of an active agent, comprising the active agent dispersed in a matrix comprising a block copolymer of formula X, formula Y, or formula Z, or a mixture thereof." .