A New Lathyrane Diterpenoid from the Whole Plant of Euphorbia altotibetica

= 11.2, H-12)], which represented the structure moieties C-1–C-5 and C-7–C-12 of a lathyrane diterpenoid, respective-ly. The HMBC correlations enable assembly of units A andB with the quaternary carbons and other functionalities. TheHMBC correlations of H-5 with C-3, C-6, C-7, and C-17,correlations of H-12 with C-11, C-13, C-14, and C-20, andcorrelations of H