Seven new azalomycin F analogs (1-7) were isolated from the broth of mangrove Streptomyces sp. 211726, and respectively identified as 25-malonyl demalonylazalomycin F5a monoester (1), 23-valine demalonylazalomycin F5a ester (2), 23-(6-methyl)heptanoic acid demalonylazalomycins F3a ester (3), F4a ester (4) and F5a ester (5), 23-(9-methyl)decanoic acid demalonylazalomycin F4a ester (6) and 23-(10-methyl)undecanoic acid demalony lazalomycin F4a ester (7). Their structures were established by their spectroscopic data and by comparing with those of azalomycins F3a, F4a and F5a. Biological assays exhibited that 1-7 showed broad-spectrum antimicrobial and anti HCT-116 activities.
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