4H-Pyrano[3',4':5,6]pyrido[2,3-d]pyrimidin-4-one, 3,6,8,9-tetrahydro-2-mercapto-8,8-dimethyl-3-(2-methylphenyl)-;8,8-Dimethyl-3-(2-methylphenyl)-2-sulfanyl-3,6,8,9-tetrahydro-4H-pyrano[3',4':5,6]pyrido[2,3-d]pyrimidin-4-one
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