Equisetolic acid or triacontanedioic acid is a chemical compound with the chemical formula . The compound is a long-chain dicarboxylic acid, one of the longest naturally occurring dicarboxylic acids. It has been found in the spores and cones of Equisetum arvense and Equisetum telmateia.

Physical properties Like other long-chain dicarboxylic acids, it demonstrates physical properties typical of fatty acids with extended carbon backbones, including high melting points and limited water solubility.

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