<http://webisa.webdatacommons.org/194932204>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/194932204>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/464367197>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/194932204> .
<http://webisa.webdatacommons.org/194932204>	<http://www.w3.org/ns/prov#value>	"Preferably, R1 and R2 are both C1-6 alkyl, and in particular R1 and R2 are both methyl." .
<http://webisa.webdatacommons.org/prov/463995268>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/194932204> .