The reaction of N,N-bis(trimethylsilyl)benzenesulfinamide with the chloronitrene complex CIN=MoCl4 in a molar ratio of 2:1 leads to the novel six-membered heterocycle 1 consisting of three nitrogen atoms, two sulfur atoms, and one molybdenum atom. Compound 1 is the first example of a metalladithiatriazine with both the metal and the sulfur atoms in their highest oxidation states.