From the Chinese crude drug shin-i, the flower buds of Magnolia farges
ii, four sesquiterpene, oplopanone (1), oplodiol (2), homalomenol A (3
) and 1 beta,4 beta,7 alpha-trihydroxyeudesmane (4) were isolated. The
se structures were elucidated and the C-13-NMR chemical shifts of thes
e compounds were revised by means of various 2D-NMR techniques.