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Therefore, tyrosinase is active with monophenols such as: umbelliferone 196 , hydroquinone 197 , 198 p- hydroxybenzyl alcohol 199 , 4-hexylresorcinol 200 , oxyresveratrol 201 , 4- n -butylresorcinol 202 , resorcinols 203 , α and β-arbutin 195 and p- coumaric acid 204 , 205 when we add the following reagents to medium of reaction: hydrogen peroxide (transforms E m to E ox ), an o- diphenol or a reducing agent such as ascorbic acid transforming E m to E d which, with molecular oxygen, is transformed into E ox