Atorvastatin (hemicalcium salt) (Standard) is the analytical standard of Atorvastatin (hemicalcium salt). This product is intended for research and analytical applications. Atorvastatin hemicalcium salt (CI-981) is an orally active 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor, has the ability to effectively decrease blood lipids. Atorvastatin hemicalcium salt inhibits human SV-SMC proliferation and invasion with IC50s of 0.39 µM and 2.39 µM, respectively[1][2][3].