<http://webisa.webdatacommons.org/prov/464853710>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/202081372> .
<http://webisa.webdatacommons.org/202081372>	<http://www.w3.org/ns/prov#value>	"Y is --O--, --S-- or --NR6 -- in which R6 is a hydrogen atom or a lower alkyl group;" .
<http://webisa.webdatacommons.org/prov/333108297>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/202081372> .
<http://webisa.webdatacommons.org/202081372>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/202081372>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .