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![1,3,4,6-tetrakis(2-mercaptoethyl)tetrahydroimidazo[4,5-d]imidazole-2,5(1H,3H)-dione](/Uploads/1569262-17-4.png "1,3,4,6-tetrakis(2-mercaptoethyl)tetrahydroimidazo[4,5-d]imidazole-2,5(1H,3H)-dione")
