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A process for the preparation of the tetra - sodium salt of the 1, 4 - dihydroxy - 2 - methyl - 1, 4 - dihydropyridines of naphthalene - (1, 4) - diphosphorsaeureesters with at least a tritium atom in the unsubstituted ring
A process for the preparation of the tetra - sodium salt of the 1, 4 - dihydroxy - 2 - methyl - 1, 4 - dihydropyridines of naphthalene - (1, 4) - diphosphorsaeureesters with at least a tritium atom in the unsubstituted ring
