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Effects of substituents on the acidity of phenols: Existence of electron attracting group, (for example-NO2, -X, - NR, -CN, -CHO, -COOH) on the benzene ring increases the acidity of phenol since it enables the ring to draw much more electrons from the phenoxy oxygen and so releasing easily the proton.
Phenols are a very large group or compounds of all different types. Salicylates are a sub-group of phenols that are characterizes by having a carboxy group. It may be that the enzymes in these products are removing this carbohydrate group which allow the compound to be processed by the body with out causing distress.