<http://webisa.webdatacommons.org/260447376>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/215929743>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/260447376> .
<http://webisa.webdatacommons.org/prov/54824531>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/260447376> .
<http://webisa.webdatacommons.org/260447376>	<http://www.w3.org/ns/prov#value>	"B is an oxygen or sulfur atom or an amino group of the formula --NH-- or --N(R')--, in which" .
<http://webisa.webdatacommons.org/260447376>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.es> .