A substantially optically-pure (S)-trans-{4-[({2-[({1-[3,5-bis(trifluoromethyl) phenyl] ethyl}{5-[2-(methylsulfonyl) ethoxy] pyrimidine-2-yl} amino) methyl]-4-(trifluoromethyl) phenyl} (ethyl) amino) methyl] cyclohexyl} aceitic acid having the effect of reducing the amount of PCSK9 proteins and increasing the amount of LDL receptors, or a salt thereof, or a solvate thereof.