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Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	wherein A1, A2, A3 and A4 independently represent a carbon or a nitrogen, and R4 is a group represented by the following formula:
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com