Thesinine is a

pyrrolizidine alkaloid Pyrrolizidine alkaloids (PAs), sometimes referred to as necine bases, are a group of naturally occurring alkaloids based on the structure of pyrrolizidine. Pyrrolizidine alkaloids are produced by plants as a defense mechanism against insect her ...

first isolated from '' Thesium minkwitzianum'' from which it derives its name. It is also found in the flowers and seeds of

borage Borage ( or ; ''Borago officinalis''), also known as starflower, is an annual herb in the flowering plant family Boraginaceae. It is native to the Mediterranean region, and has naturalized in many other locales. It grows satisfactorily in gard ...

References

Pyrrolizidine alkaloids Cinnamate esters {{alkaloid-stub