<http://webisa.webdatacommons.org/318175556>	<http://www.w3.org/ns/prov#value>	"least one group selected from Substituent Group F above and optionally having 1 or 2 hetero atoms selected from N, S and O]. <13> In certain other embodiments, the invention provides a compound according to <1> or salt thereof, wherein Ar is a group represented by the formula: [wherein R11 and R15 have the same definitions given above, and R17 and R18 are the same or different and each independent" .
<http://webisa.webdatacommons.org/318175556>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/318175556>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/464300079>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/318175556> .