The title ,-di-methyl-thio-hydantoin containing an -methyl-ated pthalimide group, CHNOS, arose from an unexpected reaction in a deep eutectic di-methyl-thio-urea-tartaric acid solvent system. The mean planes of the ring systems are twisted at an angle of 73.84 (17)°. In the crystal, weak C-H⋯O hydrogen bonds connect the mol-ecules.
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