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Determination of the relative and absolute configurations of donghaecyclinones B and C (2 and 3). (a) The simulated CP3 models of two possible diastereomer sets 2a/3a (3R*, 4S*, and 3′S*/3R*, 4S*, and 3′R*) and 2b/3b (3R*, 4S*, and 3′R*/3R*, 4S*, and 3′S*) on 2 and 3. (b) Experimental and calculated ECD spectra of 2, 2c, and 2d. (c) Experimental and calculated ECD spectra of 3, 3c, and 3d.
