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(a) Systematic numbering of trichothecenes; (b) Selected COSY and HMBC correlations of 5 (R = R' = H), 7 (R = H, R' = Ac) and 8 (R = Ac, R' = H); (c) Selected NOESY correlations within the 2D (left) and 3D (right, optimized geometry, Figure S30, Tables S1,2) structure of 5.
