Glochidonol exhibits strong inhibitory effects against three human tumor cell lines, MCF-7, NCI-H-460 and SF-268, the GI(50) values of 9.0 +/- 3.7, 4.9 +/- 0.2 and 9.8 +/- 0.5, respectively; it also exerts its antiproliferative activity through the involv

2,4-Dihydroxyphenylacetic acid is a functional moiety in the toxin molecule and the biological action of spider toxin is explained by direct interaction with an Fe-S center which is known to play an important role for the glutamate binding.

Menisdaurin is a natural product from Flueggea virosa.