<http://webisa.webdatacommons.org/154063828>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/154063828>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/464926656>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/154063828> .
<http://webisa.webdatacommons.org/prov/464280900>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/154063828> .
<http://webisa.webdatacommons.org/154063828>	<http://www.w3.org/ns/prov#value>	"Preferably, at least one but not more than three of R1 R2, R3, and R4 is an alkyl group." .