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View Patent / 1989 Rhodium-containing hydrogenation catalysts for the conversion of methacycline to doxycycline EP 283615
View Patent / 1989 Rhodium hydrogenation catalysts particularly for stereoselective hydrogenation of methacycline to doxycycline EP 283616
View Patent / 1982 Water-soluble complexes of .alpha.-6-deoxy-5-hydroxytetracycline and sodium tetrametaphosphate and their use GB 2088864
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