Eudesmane Sesquiterpenoids from the Wood of Platycarya strobilacea.

The wood of Platycarya strobilacea Sieb. et Zucc. (Juglandaceae) was used as incense. In this study, three new sesquiterpenes (2, 4, 5) and one nor- sesquiterpene (3) were isolated and their structures determined as 7-hydroperoxy-11-hydroxy-2,4-cycloeudesman-8-one (2), 8-hydroxy-13-nor-2,4- cycloeudesman-7-en-I 1-one (3), 2,4-cycloeudesma-7(11), 8-dien-(12,8)-olide (4), and 8-hydroxy-8,12-peroxy-2,4-cycloeudesm-7(l I)-ene (5). In addition, the absolute configuration of a previously reported sesquiterpene was revised based on the calculation of its ECD spectrum.