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Methyl 2-(dihydro-2H-pyran-4(3H)-ylidene)acetate: BD329444138302-49-598%; ￥7710.0100g

Ethyl 2-(dihydro-2H-pyran-4(3H)-ylidene)acetate: BD127799130312-00-498%; ￥2520.025g

Methyl 4,6-dimethyl-2-oxo-2H-pyran-5-carboxylate: BD673541264-06-698%; ￥220.0250mg

Methyl 4-formyltetrahydro-2H-pyran-4-carboxylate: BD00808803907607-89-097%; ￥4349.01g

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