roqueforti were 20 mg ml[sup -1] for cyclo(L-Phe-L-Pro) and 7.5 mg ml[sup -1] for phenyllactic acid. Combinations of the antifungal compounds revealed weak synergistic effects. The production of the antifungal cyclic dipeptides cyclo(L-Phe-L-Pro) and cyclo(L-Phe-trans-4-OH-L-Pro) ...