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process for the production of 9 - oxypteroinsaeure 9 oxypteroin - saeurederivaten, especially 9 oxypteroylglutaminsaeure (9 - oxyfolinsaeure)
process for the production of 9 - oxypteroinsaeure 9 oxypteroin - saeurederivaten, especially 9 oxypteroylglutaminsaeure (9 - oxyfolinsaeure)