A new 24-membered ring lactone, macrolactin S, was isolated from a culture broth of marine Bacillus sp. and its structure was established by various spectral analyses. Macrolactin S is the first macrolactin hydroxylated at C-12. Besides, the known compounds macrolactin A and macrolactin B were also isolated, which were elucidated on the basis of spectral data analyses and literature data comparison. They exhibited antibacterial activity against E. coli and S. aureus.
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Lu et al. (2008) studied this question.
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