Ribavirin is a guanosine (ribonucleic) analog used to stop viral rna. Ribavirin is used primarily to treat hepatitis c and viral hemorrhagic fevers. The chemical called ribavirin has the molecular formula c8h12n4o5. The formula weight has the value 244.206gmol. 1-[(2r, 3r, 4s, 5r)-3, 4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-1h-1, 2, 4-triazole-3-carboxamidesynonyms copegus, rebetol, virazoleiupac 1-[(2r, 3r, 4s, 5r)-3, 4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-1h-1, 2, 4-triazole-3-carboxamideformula c8h12n4o5molecular weight 244.206 gmolcas 36791-04-5appearance nopurity no