Abstract: This paper reports the study of DEPT, 2D H-H COSY, C-H COSY and long-range C-H COSY spectra of Clavulactone,a Dolabellane type diterpene.The long-range C-H COSY plays a very important role in the elucidation of H-C-C, H-C-C-C connectivities,therefore it is to some extent an alternative to the insensitive inadequate.

Key words: Clavulactone, 2D NMR, C-C connectivity