What is the missing symbol in the following nuclear transformation? 
+ 
→ _____ + 
Definitions:
Self-condensation
A reaction in which a molecule undergoes condensation with itself to form a larger molecule, often in the presence of a catalyst.
Ester
Organic compounds derived from an acid where at least one –OH (hydroxyl) group is replaced by an –O– (alkoxy) group.
Aldol Reaction
A type of organic reaction where an enol or an enolate ion reacts with a carbonyl compound to form a beta-hydroxyaldehyde or beta-hydroxyketone, followed by dehydration to give a conjugated enone.
Crossed Aldol Condensation
A chemical reaction involving two different carbonyl compounds to form a β-hydroxyketone or an α,β-unsaturated ketone under basic or acidic conditions.
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