Trihydride tetrazine

Most likely structure, negatively charged to account for the uneven number of hydrogen atoms.

Trihydride tetrazine, H₅C₂N₄, is a chemical compound used in UNSC emergency thrusters. When mixed with hydrogen peroxide, an explosive force is produced that is large enough to radically alter the course of UNSC ships.

The compound is used in D77-TC Pelicans to achieve "chemical thrust" during space flight.