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Structure of novel diterpene 4. Left: selected key HMBC and COSY correlations of 4. Right: determination of the absolute stereochemistry of 4 by the modified Mosher method. The values (in ppm) of Δδ=δ(S)−δ(R) for the (S,R)-MTPA derivatives of 4 are presented in the structure. The values of both δ(S) and δ(R) for the (S,R)-MTPA derivatives are described in Figure S18.
