009927-DG was the serial number for miso-olanzapine, a drug that was synthesized and used by the UNSC. It was an antipsychotic drug.

It was one of three drugs injected into the Spartan-III Gamma Company illegally. miso-olanzapine, along with cyclodexione-4 were injected to counter the effects of the mutagen drug 009762-OO. However, this drug has to be administered regularly to prevent the mutagen from permenantly affecting higher brain functions of the Spartans.[1]

Sources

  1. ^ Ghosts of Onyx page 107