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The reaction between ammonium bicarbonate, fumaric acid, and tetrabutylammonium bromide (TBAB) in methanol likely involves a nucleophilic addition of the ammonium ion to the double bond of fumaric acid, followed by cyclization and hydrolysis. The exact product will depend on the reaction conditions. Iminodisuccinic acid is a possible product, but the formation of other products such as aspartic acid or succinic acid cannot be ruled out.