NH4NO3

NH4NO3 was, according to Ian Chesterton, a chemical formula. A vial of whatever compound it denoted was found by Ian and Barbara Wright in Darrius's laboratory on Marinus. (TV: The Keys of Marinus)
== Behind the scenes ==
Though not identified as such on-screen, in the real world, NH4NO3 is "ammonium nitrate."
Category:Chemistry from the real world