<http://webisa.webdatacommons.org/prov/141656357>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/308695246> .
<http://webisa.webdatacommons.org/308695246>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/308695246>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/308695246>	<http://www.w3.org/ns/prov#value>	"In some preferred embodiments, R1 is a 2???-substituent group or a protected 2???-substituent group other than H, hydroxyl or a protected hydroxyl." .