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Dirnberger, D. and Wiegrebe, Wolfgang (1990) Stereoselective Synthesis of the Quettamine Skeleton. Archiv der Pharmazie 323, pp. 323-330.
Okamoto, Y. and Dirnberger, D. and Burgemeister, T. and Dannhardt, G. and Wiegrebe, Wolfgang (1986) Bishydrocotarnines - Stereochemical Aspects. Archiv der Pharmazie 319, pp. 1122-1129.