Background
Bassianolide is a cyclodepsipeptide insecticide synthesized by the fungal species B. bassiana and V. lecanii. In vivo, the oral administration of bassianolide induces atony in the silkworm B. mori at a concentration of 4 ppm and is lethal at doses exceeding 8 ppm. Atony is similarly induced in silkworm larvae at oral doses as low as 2 ug/larva. In isolated guinea pig smooth muscle tissue, bassianolide (0.01-1 uM) specifically inhibits the muscarinic, but not nicotinic, receptor-induced contractions in response to acetylcholine.
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