From an ethanolic extract of Delphinium formosum, in addition to a gro
up C-19 alkaloids, a new benzoxepine derivative was isolated, whose st
ructure was elucidated by spectral data, including 1D and 2D NMR techn
iques, as oxo-3,8-dihydroxy-6-methoxy-benztetrahydrooxepine.