A three-dimensional X-ray crystal structure analysis of the N(b)-methiodide of the alkaloid aspidospermine shows the molecular structure to have been correctly ascertained by chemical methods apart from the location of one ethyl group.T H E alkaloid aspidospermine obtained from the bark of Aspidosperma quebracho-blanco Schlect. was first examined chemically by Ewins in 1914, but serious attempts to elucidate
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