Tri-nucleic fungi

Tri-nucleic fungi could be broken down to produce yridium bicantizine, one of the active ingredients in ketracel-white. For this reason, the Dominion attempted to negotiate with the Federation for control of Kabrel I in 2374, so that they could synthesize a virtually unlimited supply of white in the Alpha Quadrant to sustain the Jem'Hadar.

From Memory Alpha https://memory-alpha.fandom.com/wiki/Tri-nucleic_fungus