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YM-47141 and YM-47142 are new elastase inhibitor produced by Flexibacter sp. Q17897. These structures were elucidated by MS and NMR spectral analysis. YM-47141 and YM-47142 were the cyclic peptides containing tricarbonyl moiety hydrated on the center carbonyl carbon in DMSO-d6.
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Orita et al. (1995) studied this question.
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