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Hydrolysis of a structural analogue of the substance, tetrahydromethylphthalic anhydride (MTHPA), has been investigated. The substance was found to hydrolyse rapidly, resulting in formation of the respective di-acid. The calculated half-lives at 20 degree C are, for all three pH values ( 4, 7 and 9) below 3.5 minutes (about 0.06 hours).