Yakuchinone B is an acyl-CoA:cholesterol O-acyltransferase (ACAT) inhibitor with cholesterol-lowering activity, identified in the seeds of the Zingiberaceae family. It inhibits rat liver ACAT with an IC50 value of 20.6 µM. Yakuchinone B is a potential candidate for research into hypercholesterolemia and atherosclerosis.