File:Lehrbuch der organischen Chemie (Kekule) II 505.jpg
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![File:Lehrbuch der organischen Chemie (Kekule) II 505.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/Lehrbuch_der_organischen_Chemie_%28Kekule%29_II_505.jpg/392px-Lehrbuch_der_organischen_Chemie_%28Kekule%29_II_505.jpg?20080102202638)
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