prov:value
| - ents, such as ??- and ??-hydroxy-carboxylic acids or ??-keto carboxylic acids, their salts, amides or esters and more particularly hydroxy acids such as glycolic acid, lactic acid, salicylic acid, citric acid and fruit acids in general, and 5-n-octanoylsalicylic acid; free-radical scavengers, such as a-tocopherol or esters thereof, superoxide dismutases, certain metal chelating agents, or ascorbic
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