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Boltzmann-weighted atomic contribution maps (BWAMs) of the optical rotation (OR) of calyculin A (A) and B (B) fragments.36 The atoms are colored according to their contributions to the OR, which highlights the large effects arising from the CN group and the two adjacent carbon atoms. The difference BWAM (C) of the calyculin A and B fragments also clearly visualizes the dominance of the CN group in optical activity.
