<http://webisa.webdatacommons.org/37286648>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/37286648>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/37286648>	<http://www.w3.org/ns/prov#value>	"Among the compounds of formulae (I) and (I') above, those in which R2 and R'2 are a methyl group are very particularly preferred." .
<http://webisa.webdatacommons.org/prov/465350672>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/37286648> .