He published his hypothesis, " Biogenetic Isoprene Rule ", which was the peak of his scientific career.
2.
The main reason for the challenge in determining how the secondary metabolite is produced is because ( + )-totarol does not follow the isoprene rule : the isopropyl group of ( + )-totarol is in the wrong place This hypothesis was motivated by the well known santonin-desmotroposantonin rearrangement of steroid dienones into aromatic compounds.
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