Certain trans-6-[[(substituted)pyridin-3-yl]-alkyl- and alkenyl] tetrahydro-4-hydroxypyran-2-ones and the corresponding ring- opened acids derived therefrom are potent inhibitors of the enzyme 3- hydroxy-3- methylglutaryl-coenzyme A reductase (HMG-CoA reductase) and are useful as hypocholesterolemic and hypolipidemic agents.
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