Atorvastatin N-(3,5-Dihydroxy-7-heptanoic Acid)amide Sodium Salt is an impurity of Atorvastatin (A791750) a selective, competitive HMG-CoA reductase inhibitor. Atorvastatin is the only drug in its class specfically indicated for lowering both elevated LDL-cholesterol and triglyceinhibitorrides in patients with hypercholesterolemia.