Sesquiterpene lactones and other constituents from eremanthus seidelii , eremanthus goyazensis and vanillosmopsis erythropappa - Vichnewski, W; Takahashi, A M; Nasi, Ana Maria Tucci Turco; Goncalves, D C R G; Dias, D A; Lopes, J N C; Goedken, V; Gutierrez, A; Herz, W. (Phytochemistry, 1989)