5-[2-[(3-Ethyl-3H-benzothiazol)-2-ylidene]ethylidene]-4-oxo-2-thioxo-3-thiazolidineacetic acid, 5-[2-[3-Ethylbenzothiazole-2(3H)-ylidene]ethylidene]-4-oxo-2-thioxothiazolidine-3-acetic acid, {5-[(3-Aethyl-3H-benzothiazol-2-yliden)-aethyliden]-4-oxo-2-thioxo-thiazolidin-3-yl}-essigsaeure, [5-[2-(3-Ethyl-3H-benzothiazol-2-ylidene)ethylidene]-4-oxo-2-thioxothiazolidin-3-yl]acetic acid, 5-[2-(3-Ethyl-2,3-dihydrobenzothiazole-2-ylidene)ethylidene]-4-oxo-2-thioxothiazolidine-3-acetic acid, {5-[(3-ethyl-3H-benzothiazol-2-yliden)-ethyliden]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid, 2-Thioxo-4-oxo-5-[2-[(3-ethyl-2,3-dihydrobenzothiazole)-2-ylidene]ethylidene]thiazolidine-3-acetic acid, 5-[2-(3-Ethyl-2,3-dihydrobenzothiazole-2-ylidene)ethylidene]-2-thioxo-4-oxothiazolidine-3-acetic acid, 2-Thioxo-4-oxo-5-[2-(2,3-dihydro-3-ethylbenzothiazole-2-ylidene)ethylidene]thiazolidine-3-acetic acid