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Chemical structure of beauvericin, enniatin A, A1, B and B1. Beauvericin (BEA), R1 = R2 = R3 = phenylmethyl; Enniatin A (ENN A), R1 = R2 = R3 = –CH(CH3)CH2CH3; Enniatin A1 (ENN A1), R1 = R2 = –CH(CH3)CH2CH3, R3 = –CH(CH3)2; Enniatin B (ENN B), R1 = R2 = R3 = –CH(CH3)2; Enniatin B1 (ENN B1), R1 = R2 = –CH(CH3)2, R3 = –CH(CH3)CH2CH3.
