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Chemical compound
Carnosic acid is a natural benzenediol abietane diterpene found in rosemary ("Rosmarinus officinalis") and common sage ("Salvia officinalis"). Dried leaves of rosemary and sage contain 1.5 to 2.5% carnosic acid.
Carnosic acid and carnosol, a derivative of the acid, are used as antioxidant preservatives in food and nonfood products, where they're labelled as "extracts of rosemary" (E392).
References.
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