Polyketide synthase producing naringenin chalcone. Can use p-coumaryl-CoA as substrate. 4-coumaroyl-CoA + 2 H(+) + 3 malonyl-CoA = 2',4,4',6'-tetrahydroxychalcone + 3 CO2 + 4 CoA Secondary metabolite biosynthesis; flavonoid biosynthesis. Homodimer. Expressed in fruits. Accumulates in fruits when berries are red and full size. Belongs to the thiolase-like superfamily. Chalcone/stilbene synthases family.