Bicuprodyanide is a neural toxin that is deadly to alien races with an oxygen transported metabolism that is bicupric-based, such as Andorians or Bolians.

In 2374, Vash had an accomplice inject her with a dart containing bicuprodyanide to stall an investigation by the crew of Deep Space 9 into the Pah-wraith Red Orbs of Jalbador. (DS9 - Millennium novel: The Fall of Terok Nor)

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