| http://www.w3.org/ns/prov#value | - The starting compound thiazolidine-4-one may also be a derivative of thiazolidine-2,4-dione In this case, if R1 is a substituent other than a hydrogen atom, this substituent may have been introduced into the thiazolidine-2,4-dione by means of one of its alkali metal salts, generally the potassium salt formed by treatment with potash in solution in ethanol at room temperature (the corresponding sod
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