<http://webisa.webdatacommons.org/33144997>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/407209141>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/33144997> .
<http://webisa.webdatacommons.org/prov/407209120>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/33144997> .
<http://webisa.webdatacommons.org/33144997>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .
<http://webisa.webdatacommons.org/33144997>	<http://www.w3.org/ns/prov#value>	"R3 and R4 are each particularly preferably hydrogen." .