What is the best choice of reagent to accomplish the following transformation? 
Definitions:
Carvedilol
A medication used to treat high blood pressure and heart failure, functioning as a beta-blocker that also dilates blood vessels.
Heart Failure
A condition in which the heart is unable to pump sufficiently to maintain blood flow to meet the body's needs.
PO
A medical abbreviation for "per os," Latin for "by mouth," indicating that medication or food should be taken orally.
Nifedipine Extended Release
A form of medication designed to release the active ingredient, nifedipine, slowly over time to treat conditions such as high blood pressure and angina.
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