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1H, 13C NMR and X-ray crystallography have demonstrated the azomethine structure of the addition product obtained from N-amino-2,3-(9,10-dihydro-9,10-anthracenediyl)succinimide and diethyl acetylenedicarboxylate. The exo cyclic nitrogen exists in sp2-state and its lone pair lies in anti orientation while the diethyl succinate moiety has been demonstrated to be syn to the cage and orthogonal to the succinimide plane. On acetylation the product is transformed into N-acetyl derivative which exhibits restricted rotation about N–N bond and a preferred conformation with N-acetyl in syn-orientation.

Hyosmin (1) a new lignan has been isolated from the seeds of Hyoscyamus niger L. (Solanaceae), and its structure shown to be the 3-{[(2R)-2-carbomethoxy-2-hydroxy]ethyl}benzoate ester of {(2R,3S,4S)-2-(4-hydroxy-3-methoxyphenyl)-3-hydroxymethyl-4-[(4-hydroxy-3-methoxyphenyl)methyl]tetrahydrofuran.