Dithiazine derivatives

Corrosion of metallic tubulars in an oil, gas or geothermal well may be inhibited by introducing into the well a dithiazine derivative of the formula: wherein R 14 is a C 1 -C 24 straight chain or branched alkyl group; or a C 6 -C 24 aryl or arylalkyl group; R 15 is a C 1 -C 6 alkyl or a C 6 -C 30 aryl or alkylaryl group; and X is chlorine, bromine or iodine. The dithiazine may be isolated from a whole spent fluid (WSF) formed by reaction of hydrogen sulfide and a triazine. Alternately, the whole spent fluid containing dithiazine or dithiazine derivative and a corrosion inhibiting formulation may be used to inhibit corrosion in the well.