A (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol written confirmation ((5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol WC) is an official document issued by a regulatory agency to a (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol manufacturer, verifying that the manufacturing facility of a (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol active pharmaceutical ingredient (API) adheres to the Good Manufacturing Practices (GMP) regulations of the importing country. When exporting (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol APIs or (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol finished pharmaceutical products to another nation, regulatory agencies frequently require a (5Z,10-secocholesta-5,7,10(19)-triene-1.alpha.,3.beta.,25-triol WC (written confirmation) as part of the regulatory process.
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