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Chemical structures of ascorbic acid and its derivatives: (a) ascorbic acid (ASA), (b) ascorbyl-2-glucoside (ASC-G), (c) ascorbyl-6-octanoate (ASC-8), (d) ascorbyl-6-palmitate (ASC-P), (e) ascorbyl-6-stearate (ASC-S), and (f) ascorbyl-2,6-dipalmitate (ASC-DP).
