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221. The constitution of aspidospermine. Part III. Reactivity at the nitrogen atoms, and biogenetic considerationsEverett, A. J.; Openshaw, H. T.; Smith, G. F. · Journal of the Chemical Society (Resumed) · 1957
220. The constitution of aspidospermine. Part II. Ultraviolet absorption of the Bz-methoxy-tetra- and -hexa-hydrocarbazolesChalmers, J. R.; Openshaw, H. T.; Smith, G. F. · Journal of the Chemical Society (Resumed) · 1957