Sauruchinenols A and B, unprecedented monocyclic diterpenes with new carbon skeleton from the aerial parts of Saururus chinensis.

Sauruchinenols A (1) and B (2), two novel monocyclic diterpenes with unique carbon skeleton, as well as two new structurally related diterpenes, sauruchinenols C (3) and D (4), were isolated from the aerial part of Saururus chinensis. Their structures were elucidated based on the analysis of spectroscopic data. A hypothetical biogenetic pathway for sauruchinenols A and B was proposed.