4′-Hydroxy-2′-methylacetophenone, an aroma compound of red wines, is isolated from cv. Bobal grape variety. 4′-Hydroxy-2′-methylacetophenone has ciliate toxicity. 4′-Hydroxy-2′-methylacetophenone inhibits the growth of T. pyriformis, with an IC50 of 0.65 mM[1][2].