Five new diterpenes were isolated from Euphorbia sieboldianaand identified as atis-16-en-13(S)-hydroxy-3,14-dione(Ⅰ),atis-16-en-14-oxo-13(S),3 β-diol(Ⅱ),atisane-3-oxo-16α,17-diol(Ⅳ),atisane-3β,16α,17-triol(Ⅴ)and atisane-3β-acetyl-16α,17-diol(Ⅵ)based onthe chemical,spectral evidences and X-ray diffraction.
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