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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

Chloromethylation of 5-Lbutyl-l ,3-dimethylbenzene (I) yields a single product which was identified by Carpenter (1) as 2-<-butyl-4,6-dimethylbenzyl chloride (II). The symmetrical structure (III), however, was assigned to this compound by Fuson, Denton, and Kneisley (2) and by Buu-

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