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Our work was supported by the Deutsche Forschungsgemeinschaft. We thank H. Nimz, O. Faix, D. Meier, and V. Ittekkot for reference compounds and helpful discussions; E.T. Degens for his interest and encouragement. Technical assistance by U. Kruse is gratefully acknowledged.
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Mycke, B., Michaelis, W. Lignin-derived molecular fossils from geological materials. Naturwissenschaften 73, 731–734 (1986). https://doi.org/10.1007/BF00399243
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DOI: https://doi.org/10.1007/BF00399243