A carbonyl compound P, which gives positive iodoform test , undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis Q leads to a dicarbonyl compound R . Which undergoes intramolecular aldol reaction to give predominantly S.
$P\stackrel{1.MeMgBr}{\underset{\begin{array}{c}2.H^{+}\text{,}{H}_{2}O\\ 3.H_{2}S{O}_4\text{,}\Delta \end{array}}{\to }}Q\stackrel{1.O_3}{\underset{2.Zn\text{,}{H}_{2}O}{\to }}R\stackrel{1.O{H}^{-}}{\underset{2.\Delta }{\to }}S$
The structure of the carbonyl compound P is

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