What is the dart frog toxin allegedly used to kill Alexei Navalny?

The toxin, epibatidine, can be found in frogs in the wild in South America or manufactured in a lab.

What is dart frog toxin, which is said to have been used to kill Alexei Navalny?

Epibatidine is about 100 times more potent than morphine, and derived from frogs native to South America ...
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What is epibatidine, and how did it kill Navalny? A guide to the frog neurotoxin that five countries say poisoned Russia’s opposition leader.

The United Kingdom, Sweden, France, Germany, and the Netherlands announced that a substance called epibatidine killed Alexey Navalny, the opposition leader who died in a Russian prison in February ...

Toxin used to kill Alexei Navalny likely synthetic, not sourced from dart frogs, say experts

Following accusations against Russia for poisoning Alexei Navalny, experts indicate the neurotoxin involved is likely a ...

Kremlin had possession of frog poison used to kill Navalny, foreign secretary claims

Vladimir Putin’s Kremlin "has had possession" of the deadly frog toxin that was found in the body of Russian opposition ...