Come again?

... Distribution of the Double Linkings in Irone.

THE formulation of Irene as 1: 1: 2: 6-tetra-methyltetralin has recently been established synthetically by Bogert and Apfelbaum. On the basis of this formulation of irene and the production of ββγ-trimethyl pimelic acid by ozonization of irone, structural formulæ have been postulated for this ketone by Ruzicka and his co-workers. Two of the postulated structures contain the chromophoric system C = C – C = C – C = O which should therefore give rise to a characteristic absorption spectrum.

I couldn't have put it better myself.