Hydrazine (N2H4) is a compound that was used aboard Starfleet shuttlecraft.

In 2373, Captain Kathryn Janeway and Commander Chakotay were forced to crash land the shuttlecraft Sacajawea during an away mission after it was exposed to electrical interference from a nearby planet. As a result of the damage caused during landing, the shuttle began leaking hydrazine into the cabin, forcing Janeway and Chakotay to abandon it. (VOY: "Coda")

The Star Trek Encyclopedia (4th ed., vol. 1, p. 352) described hydrazine as a "powerful reducing agent used as a hypergolic chemical rocket propellant. Hydrazine was used in reaction control thrusters on Starfleet shuttlecraft."

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