A compound of Formula (I): or a metabolite thereof, or an ester of the compound of Formula (I) or the metabolite thereof, or a pharmaceutically acceptable salt of each thereof, wherein m, n, X1 and X2 are as defined herein, is useful for reducing blood levels of one or more of triglycerides (TG), total cholesterol (TC) and low density lipoprotein (LDL) in human subjects.