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Carbon chemical shift comparison of the D and F ring cores of the model diastereoisomers 1 and 3 (A) with those of 5 and 6 (B), enabling the assignment of the absolute configurations at C-2 of the terminal units. The systematic evaluation of full Δδc maps of all four Atype dimers (Figure 5) led to the conclusion that the precise δc values of C-2 and C-9 are reliable indicators of the absolute configurations of terminal units in A-type OPACs.
