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UHPLC−ESI−TOF−MS chromatograms and HRESIMS data of [M+HCOO]− ion of uscharin (A), 2′-epi-uscharin (B), the reaction mixture in mild acidic condition of 1% formic acid on day 3 (C), and the reaction mixture in mild alkaline condition of 1% ammonium hydroxide on day 7 (D).
