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Thus the rings II to VII form a compact three-dimensional structure with the plane benzene ring I projecting outwards.References BEEVERS, C. A. & ROBERTSO~, J. H. (1950 There are four molecules of strychnine in the unit cell. As the heavy atom lies on the symmetry centre of the [010] projection, the application of the Fourier method for this projection follows the well-known lines developed for the phthalocyanine structure. For the non-centro-symmetrical [001] projection the phase angles, except for their signs, were derived from the intensity comparison of the isomorphous structures of the sulphate and the selenate. A symmetrical Fourier synthesis was made, and from this and the [010] projection the atomic positions were found. The strychnine structure thus derived proved to be concordant with that one of the competing structure formulas which just then was unequivocally accepted by the organic chemists. After suitable refinement, averaged errors amount to 0.08 A. for both projections.

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