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" ... Molnupiravir was first developed as preventative medicine and treatment for SARS-CoV and MERS in the early 2000s. The drug has been previously shown to work against many viruses that employ an RNA-dependent RNA polymerase, which SARS-CoV-2 also has. The polymerase is the enzyme that copies the genetic material of the virus into new genetic material and produces the messenger RNAs that direct the production of all the viral proteins. Molnupiravir is a shape-shifter, called a tautomer. It assumes two forms, one which closely resembles uracil and the other cytosine. ... "