[R-(R*,R*)]-2-(4-fluorophenyl)-.beta.,.delta.-dihydroxy-5-((1-methylethyl)- -3-phenyl-4-[(phenylamino)-carbonyl)]-1H-pyrrole-1-heptanoic acid or (2R-trans)-5-(4-fluoro-phenyl)-2-(1-methylethyl-N,4-diphenyl-1-[2-(tetrah- ydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1H-pyrrole-3-carboxamide; and pharmaceutically acceptable salts thereof.