RecName- Full=Chalcone--flavonone isomerase 2; Short=Chalcone isomerase 2; EC=5.5.1.6;; Catalyzes the intramolecular cyclization of bicyclic chalcones into tricyclic (S)-flavanones. Responsible for the isomerization of 4,2',4',6'-tetrahydroxychalcone (also termed chalcone) into naringenin (By similarity) (234 aa)