<http://webisa.webdatacommons.org/143500344> <http://www.w3.org/ns/prov#wasQuotedFrom> <faqs.org> . <http://webisa.webdatacommons.org/prov/215736130> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/143500344> . <http://webisa.webdatacommons.org/143500344> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/143500344> <http://www.w3.org/ns/prov#value> "wherein W is --NH-- or --N(CH3)--, or, [0027] wherein X is a bond or" .