Revision of the structure of ajmalimine.

Careful reexamination of the published 1H and 13C NMR spectral data of ajmalimine (1), an indole alkaloid from the roots of Rauvolfia serpentina, indicates that, in reality, the compound is (+)-17R-O-(3',4',5'-trimethoxybenzoyl)ajmaline (3).

p-Terphenyl- and phenanthraquinone derivatives: an NMR study.

(1)H- and (13)C-NMR spectral data are presented for six p-terphenylquinone derivatives (and for two monosubstituted quinones 1 and 2, used as model compounds) and for 9,10-phenanthraquinone and retenequinone. The chemical shifts were confirmed through correlation spectroscopy and NOE measurements.