Two new 8,14-dihydromorphinandienone alkaloids were isolated from the dried leaves of Croton micradenus. Spectroscopic analysis established their structures as trans B/C-4-hydroxy-3,6-dimethoxy-5,6-didehydromorphinan-7-one and cis B/C-4-hydroxy-3,6-dimethoxy-5,6-didehydromorphinan-7-one to which we have given the name of norocobotrine and nildahilline.
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