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2S) -N-ethyl-N-methyl-pseudoephedrine of concentration 27.9% (pp). Subsequently, 3.53 g of tetraethylorthosilicate and 0.038 g of tin tetrachloride are added, leaving the mixture to stir to remove the ethanol. Finally 0.21 g of hydrofluoric acid (48% pp) are added, and it is stirred...
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