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Chemical structure of the antifungal cyclic tetrapeptide [cyclo-(prolyl-valyl-alanyl-isoleucyl)] isolated from B. velezensis CE 100 culture broth underlying 1H-1H COSY (bold lines) and HMBC (arrows) correlations. Carbon position is represented as ′ for valine, ″ for alanine, and ‴ for isoleucine.
