Guanfu base H is a diterpenoid alkaloid isolated from Aconitum coreanum. It has antiplasmodial activity against the malarial Plasmodium falciparum strains TM4 8.2 (wild type) and K1CB1 (IC50s: 4 μM and 3.6 μM).
Ryanodine, a diterpenoid poison derived from Ryania speciosa, acts as a modulator of the ryanodine receptor, which is permeable to cells. Depending on its concentration, ryanodine can either stimulate or inhibit Ca2+ release mediated by these receptors.