Pyrosulfate
A pyrosulfate was a chemical compound containing the pyrosulfate ion, S2O72-, composed of sulfur and oxygen.

In 2152, a Retellian freighter expelled a cloud of dilithium hydroxyls and ionized pyrosulfates into the 's path, clogging the plasma vents and preventing the Enterprise from engaging its warp drive. ()
Chemical compounds
de:Pyrosulfat