6,7,8,9-Tetrahydro-1,3-dimethyl-6,8-dithioxo-1H-purin-2(3H)-one;6,7-Dihydro-1,3-dimethyl-8-mercapto-6-thioxo-1H-purin-2(3H)-one;8-Mercapto-6-thiotheophylline
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