[Source] Cyanoxis D-587 was a poison produced by a company called Toxico that was designed to exterminate conduit worms, vermin that thrived on the planet of Coruscant. In 23 and 22 BBY, Toxico advertised Cyanoxis D-587 on Coruscant's HoloNet News, employing a disclaimer stating that the poison was not intended as a weapon.