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Skeletal formula of salicylic acid showing a benzene ring with hydroxyl and carboxyl groups.

Chemical structure of phthalic acid, featuring a benzene ring with two carboxylic acid groups.

Structural formula of 2-methylhexanoic acid with a carboxylic acid group highlighted in red.

Chemical structure of palmitic acid, a saturated fatty acid with a 16-carbon chain.

Structural formula of azelaic acid, a dicarboxylic acid with nine carbon atoms.

Chemical structure of adipic acid, featuring a six-carbon chain with two terminal carboxylic acid groups.

Chemical structure of oleic acid, a monounsaturated fatty acid with a carboxyl group.

Chemical structure of lauric acid, a saturated fatty acid with a 12-carbon chain and carboxyl group.

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