18-nor-Podocarpanes and podocarpanes from the Bark of Taiwania cryptomerioides

Seven nor- and podocarpane-type diterpenes were isolated from the bark of Taiwania cryptomerioides. Podocarpane-type diterpenes do not occur extensively, and the 18-nor podocarpane skeleton has not been reported in nature. All compounds were spectroscopically identified using 1D and 2D NMR techniques.