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2-(2-hydroxy-2-phenylethyl)-3-[(phenylmethyl)oxy]-4H-pyran-4-one of the formula P-3 and/or 2-[(E)-2-phenylethenyl]-3-[(phenylmethyl)oxy]-4H-Pyran-4-one of the formula P-4

US Patent 8981129 · Granted Mar 17, 2015

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