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Tetrahydropyran-4-carbaldehyde Tetrahydro-4-pyranol Tetrahydropyranyl-4-acetic acid Methyl tetrahydropyran-4-carboxylate Tetrahydro-4H-pyran-4-one TETRAHYDRO-2H-PYRAN-4-CARBOXAMIDE Tetrahydro-pyran-4-yl)-hydrazine tetrahydrofuran-2-carboximidamide hydrochloride Dicyclopentadiene diepoxide PICROTOXININ