1H-purine-2,6-dione, 8-[(E)-2-(2,3-dimethoxyphenyl)ethenyl]-3,9-dihydro-1,3-dimethyl-;8-[(E)-2-(2,3-dimethoxyphenyl)ethenyl]-1,3-dimethyl-3,9-dihydro-1H-purine-2,6-dione
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