The Structure of Himbosine

Since himbosine was available in only relatively small amount and since its structure appeared likely to provide the key to the large ester group an X-ray crystallographic examination of the hydrobromide was undertaken by Lovell (15). The structure determined by him is represented by XXVII, in which relative stereochemistry only is implied. 

Concurrent chemical studies on other members of the ester group have shown that they also possess the same hexacyclic cage structure 16). 

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