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Modified amino acids, pharmaceuticals containing these compounds and method for their production App 20090163480 - RUDOLF; Klaus ;   et al. | 2009-06-25 |
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Piperazine derivatives, pharmaceutical compositions containing these compounds, their use and processes for preparing them Grant 5,700,801 - Pieper , et al. December 23, 1 | 1997-12-23 |
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