The primary product of this enzyme is 4,2',4',6'-tetrahydroxychalcone (also termed naringenin-chalcone or chalcone) which can under specific conditions spontaneously isomerize into naringenin. 4-coumaroyl-CoA + 2 H(+) + 3 malonyl-CoA = 2',4,4',6'-tetrahydroxychalcone + 3 CO2 + 4 CoA Secondary metabolite biosynthesis; flavonoid biosynthesis. Major expressed member of the gene family in various floral tissues and in seedlings treated with UV light. It is relatively low expressed in tissue culture material. Belongs to the thiolase-like superfamily. Chalcone/stilbene synthases family.