<http://webisa.webdatacommons.org/138416509>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/465356513>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/138416509> .
<http://webisa.webdatacommons.org/138416509>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/138416509>	<http://www.w3.org/ns/prov#value>	"The method of claim 3, wherein R4 is a protecting group selected from the group consisting of acetyl, benzoyl, dimethylformamidine, isobutyrl, phenoxyacetyl, and isopropyl-phenoxyacetyl." .