<http://webisa.webdatacommons.org/prov/54109555>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/438698822> .
<http://webisa.webdatacommons.org/438698822>	<http://www.w3.org/ns/prov#value>	"X is an oxygen atom, a sulfur atom, NR.sup.2 (R.sup.2 is a hydrogen atom or a C.sub.1-6 alkyl group), SO, SO.sub.2 or a single bond (when R.sup.1 is a halogen atom, then X is a single bond)," .
<http://webisa.webdatacommons.org/438698822>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<patents.com> .
<http://webisa.webdatacommons.org/prov/215812659>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/438698822> .
<http://webisa.webdatacommons.org/438698822>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .