A further study of the alkaloidal constituents of Delphinium cardiopet
alum led to the isolation of five new highly functionalized diterpenoi
d alkaloids, cardiopine, cardiopinine, cardiopimine, cardiopidine and
cardiodine. Their structures were established by 1D and 2D NMR spectro
scopy, (HCOSY)-H-1, HMQC, HMBC and ROESY, and chemical transformations
.