(S,S)-Valifenalate ((S,S)-IR5885) is an acylamino acid fungicide and is used to control a wide range of fungi belonging to the class of Oomycetes. (S,S)-Valifenalate ((S,S)-IR5885) interferes with the cell-wall synthesis thus affecting the growth stages of the pathogens controlled, both outside (on the spores) or inside the plant (on the mycelium).