<http://webisa.webdatacommons.org/prov/465356513>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/40741495> .
<http://webisa.webdatacommons.org/prov/131578822>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/40741495> .
<http://webisa.webdatacommons.org/40741495>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/40741495>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/40741495>	<http://www.w3.org/ns/prov#value>	"In some embodiments, R3 and R4 are each H. In some embodiments, R3 is H and R4 is a protecting group." .