The preparation of atorvastatin calcium epoxide dihydroxy (AED) is described. AED can be used as a standard or marker in determining the amount of AED in a sample. AED can therefore be used as a tool in preparing atorvastatin calcium substantially free of AED.

 
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< Urea antagonists of P2Y.sub.1receptor useful in the treatment of thrombotic conditions

> Expression of plasminogen and microplasminogen in duck weed

> Intracellular formation of peptide conjugates
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