<http://webisa.webdatacommons.org/prov/63419341>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/189800364> .
<http://webisa.webdatacommons.org/189800364>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/189800364>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<freepatentsonline.com> .
<http://webisa.webdatacommons.org/189800364>	<http://www.w3.org/ns/prov#value>	"Generally not more than five of the R and K variables on each ring are other than hydrogen." .