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Zerumbone derivatives. (a) (±)-[6E, 10E]-3amino-2,6,9,9-tetramethylcloundeca-6,10-dienone (5), (b) (±)-[6E, 10E]-3-butylamino-2,6,9,9-tetramethylcloundeca-6,10-dienol (10),(c) (±)-[10E]-3-butylamino-6,7-epoxy-2,6,9,9-tetramethylcloundeca-10-enone (14), and (d) (±)-[2E, 6E]-10-cyano-2,6,9,9-tetramethylcloundeca-2,6-dienone (20).
