<unk>  is the coordination compound with the approximate formula Co2(EDTA)(H2O)6.
Solutions of this solid have been used in Europe as an antidote to cyanide poisoning.
It is a derivative of the (non-natural) amino acid ethylenediaminetetraacetate.
Dicobalt edetate
Almagate
Ipodate sodium
Methenamine mandelate
Acetylcysteine 
Aluminium nicotinate
Sodium aurothiomalate
Fomepizole