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A: Extracted mass spectra 391.3 [M+H]+ of α-CDMOHC. B: α-CDMOHC structure and calculated fragments. C: Extracted mass spectra 446.4 [M-H]− of 13-hydroxy-α-tocopherol. D: 13-Hydroxy-α-tocopherol structure and calculated fragments. α-CDMOHC, α-carboxydimethyloctylhydroxychroman.