Yurfloo was a poison that existed by the time of the Galactic Civil War. Between 3 ABY and 4 ABY, the assassin Ochi of Bestoon acquired the poison at Zlarb's on the planet Coruscant for his assassination of the Emperor's Royal Guard. After Ochi used Ziroxin-12 to poison the breakfast of the Royal Guard, he realized that that one of the guards were not present. Once he found the guard, Ochi was forced to poison the guard with Yurfloo to account for the timing difference.