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Potently antiviral polyniobotungstates have been structurally characterized; the dimer A-α-[Si2Nb6W18O77]8– cleaves cleanly to the monomer A-α-[SiNb3W9O40]7– within 1 min in aqueous solution buffered at physiological (neutral) pH establishing that the monomer and not the dimer is pharmacologically relevant.
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Kim et al. (1999) studied this question.
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