Pharmaceutically useful compounds having ACAT inhibitory activity of the formula ##STR1## wherein n is 0, 1, or 2, for X other than tetrazole and n=2 then R.sub.2 =R.sub.3 =H; R.sub.1 is phenyl, substituted phenyl, naphthyl, substituted naphthyl, a heteroaromatic group or a hydrocarbon group having from one to 18 carbon atoms; R.sub.2 and R.sub.3 are hydrogen, halo, hydroxy, alkyl, alkenyl, cycloalkyl, phenyl, substituted phenyl, a heteroaryl, or form a spiroalkyl group; X is a heteromonocyclic 5-membered ring containing one to four heteroatoms, said heteroatoms being nitrogen, oxygen or sulfur, and combination thereof; and R.sub.4 is a hydrocarbon group having from one to 20 carbon atoms are described as well as methods of their manufacture.