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Buergi Dunitz Winkel.svg BrgiDunitzWinkel Selbstgezeichnet nach Warren Clayden Organic Chemistry de Leyo CommonsHelper Tox de original upload log page de BuergiDunitzWinkel svg Ixitixel bytes no repariert hoffentlich Tox bytes no nach Warren Clayden Organic Chemistry Ntige Schpfungshhe nicht erreicht Chemical reactions