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Chemical alterations after sulfur fumigation in (A) Paeoniae Radix Alba (Bai Shao); (B) Angelicae Dahuricae Radix (Bai Zhi); and (C) Ginseng Radix et Rhizoma (Ren Shen). R1, R2, and R3 represent different sugar moieties, and one of these circled sugar moieties were replaced with SO3H group after sulfur fumigation.
