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Determination of the absolute configuration of donghaecyclinone A (1). (a) ΔδS-R values of the MTPA esters (1a and 1b) in DMSO-d6. (b) the simulated DP4 models of the two possible diastereomers 1c/1d (3R, 4S, 7S, and 12S/3R, 4S, 7R, and 12R) of 1.
