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    Spiro[xanthen-9',2-(3,6-dihydro-4,5-dimethyl-2H-thiopyran)]
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    Spiro[xanthen-9',2-(3,6-dihydro-4,5-dimethyl-2H-thiopyran-S-oxid)]
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    3,4-Dimethyl-2-(9'-xanthenyl)thiophen
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    氧杂蒽
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