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LC-MS profile of ethyl acetate (EA) extract from B. subtilis BSXE-1601 cell-free supernatant. (A) Amicoumacins A-C (1–3) were revealed from the chromatogram (DAD, λ = 314 nm) based on their specific m/z: 424 [M + H]+ for 1, 425 [M + H]+ for 2 and 407 [M + H]+ for 3; (B) Structures of amicoumacins.
