Eudesmanolides and Guaianolides from Carpesium triste

A new eudesmanolide, 1‐oxo‐11 αH ‐eudesma‐2,4(14)‐dien‐12,8 β ‐olide ( 1 ), and four new guaianolides, 9 β ,10 β ‐epoxy‐4 α ‐hydroxy‐1 βH ,11 αH ‐guaian‐12,8 α ‐olide ( 2 ), 9 β ,10 β ‐epoxy‐4 α ‐hydroxy‐1 βH ,11 βH ‐guaian‐12,8 α ‐olide ( 3 ), 4 α ,9 α ‐dihydroxy‐1 βH ,11 αH ‐guai‐10(14)‐en‐12,8 α ‐olide ( 4 ), and 4 α ,9 α ‐dihydroxy‐1 βH ,11 βH ‐guai‐10(14)‐en‐12,8 α ‐olide ( 5 ), together with one known eudesmanolide and two known germacranolides, were isolated from the whole plants of Carpesium triste. Their structures and relative configurations were elucidated on the basis of spectroscopic methods, including 2D‐NMR techniques.