Two new diterpene polyesters, serrulatin A (1) and B (2), were isolated fro
m an n-hexane extract of the whole, undried plant of Euphorbia serrulata. T
he structures were elucidated by various spectroscopic methods, including E
SI-MS, IR, UV, 1D and 2D NMR techniques and X-ray crystallography. Serrulat
in A contains a hitherto unknown heterocyclic ring system, while serrulatin
B is a diterpene, which can be formally derived from 1 by ring opening. (C
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