Two new diterpenes from Euphorbia kansuensis

Two new lathyrane diterpenes, 3β,5α-dihydroxy-15β-cinnamoyloxy-14-oxolathyra-6Z,12E -diene (1) and 3β,5α,20-trihydroxy-15β-cinnamoyloxy-14-oxolathyra-6Z,12E-diene (2), were isolated from the roots of Euphorbia kansuensis. Their structures were determined by spectroscopic methods.