Hytritium
Hytritium was the only compound able to neutralize tricyanate contamination. It was highly unstable, expensive to produce, and too dangerous to deliver by transporter, so many traders stopped buying and selling it. Zibalian trader Kivas Fajo was in possession of 108 kilos of the substance aboard his ship Jovis when the  required it to clean the water table of the planet Beta Agni II in 2366.

In reality, Fajo had actually created the contamination, using the transfer of the substance to kidnap Data in order to add him to his collection of rare treasures, destroying the shuttlecraft Data had used and using enough of the same materials from which the android was created to make Enterprise believe he had perished in the explosion. 

Unfortunately for Fajo, the hytritium neutralized the tricyanate so quickly that it became clear that the water had been poisoned, leaving the Enterprise crew suspicious of the trader who happened to have just the right amount of the rare compound just when it was needed most. This led to the deduction that his true motive had been to abduct Data and fake his death. ()

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Chemical compounds
Materials