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El aceite se disuelve en acetona caliente, se enfría y se rasca dentro del matraz con vara de vidrio para precipitar la 2-carbometoxitropinona. Recristalizar 16 g de este producto en 30 ml de acetato de metilo caliente y añadir 4 ml de agua fría y 4 ml de acetona. Ponga en el congelador por 2.5-3 horas.
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