Identify the major product obtained in the following reaction:
The reaction is a Cannizzaro reaction (specifically an intramolecular Cannizzaro reaction) of o-phthalaldehyde with Tollens' reagent. The two aldehyde groups undergo disproportionation to form a carboxylic acid group (as a carboxylate) and an alcohol group, resulting in the formation of 2-(hydroxymethyl)benzoate.
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