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Spectral assignments of new diterpenes from Hyptis martiusii Benth

The structural characterization of two new abietanes and a new spiro‐fused tricyclic diterpene isolated from the roots of Hyptis martiusii is described. The first member of a new class of rearranged abietane diterpenoids designated martiusane was characterized by the use of 1D NMR and several 2D shift correlated NMR pulse sequences (1H, 1 H‐COSY, HMQC, HMBC and NOESY). Unambiguous 1H and 13C chemical shift assignments for all compounds are reported. Copyright © 2004 John Wiley & Sons, Ltd.