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Ritonavir, with trade name Norvir (Abbott Laboratories), is an antiretroviral drug from the protease inhibitor class used to treat HIV infection and AIDS. Its structure is composed of 61.637% C, 6.724% H, 11.660% N, 11.097% O and the remainder is sulfur (S). Determine the empirical formula for NorvirTM and its molecular formula given that its molar mass is 720.946 g/mol.

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