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Home › Esters and amides of aminomethylenecyanoacetic acid a cosmetic preparation containing the same as a sunscreen agent and a method for protecting human skin using the same

Esters and amides of aminomethylenecyanoacetic acid a cosmetic preparation containing the same as a sunscreen agent and a method for protecting human skin using the same

US Patent 5443820 · Granted Aug 22, 1995

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